时间：2026-03-30 18:39:24 112浏览 收藏
本文深入解析了HTML中multiple属性的正确用法与常见陷阱，明确指出它仅对``和``元素生效：前者支持多文件选择并返回只读的FileList，后者需配合size属性才能正常显示多选项且必须通过selectedOptions获取选中值；文章特别警示了给不支持的元素（如``）添加multiple纯属无效操作，并系统梳理了UI渲染异常、JavaScript取值误区、跨浏览器兼容性限制（尤其是iOS Safari的历史兼容问题）、移动端差异、accept属性协同规则，以及后端接收多文件时易犯的结构解析错误，帮助开发者避开从代码编写到部署上线的全链路坑点。
multiple
multiple 不是全局属性，只对特定表单控件生效。它只在 和 上起作用，其他元素（比如 或 </code>）加了也无效，浏览器直接忽略。</p> <p>常见错误现象：给 <code><input type="email"></code> 加 <code>multiple</code>，以为能输多个邮箱——不行，语法合法但无行为变化；用户仍只能填一个值，JS 读取的 <code>value</code> 也不会变。</p> <ul><li><code><input type="file" multiple></code>：允许用户一次选多个文件，<code>files</code> 属性返回 <code>FileList</code> 对象</li> <li><code><select multiple></code>：启用多选下拉，用户按 Ctrl/Cmd 或拖选，<code>selectedOptions</code> 返回多个 <code>HTMLOptionElement</code></li> <li>不支持的元素加 <code>multiple</code>：不报错，但没效果，别白费劲</li> </ul><h3><code>multiple</code> 在 <code><select></code> 中怎么用才不出错</h3> <p>加了 <code>multiple</code> 后，<code><select></code> 的交互逻辑和单选完全不同：默认不显示选项，必须设置 <code>size</code>（如 <code>size="4"</code>）才能看到多个选项；否则只显示一行，用户根本不知道能多选。</p> <p>另一个坑是 JS 获取值的方式：不能用 <code>select.value</code>（它只返回第一个选中项的 <code>value</code>），得遍历 <code>select.selectedOptions</code> 或用 <code>Array.from(select.options).filter(opt => opt.selected)</code>。</p> <ul><li>必须显式设 <code>size</code> 属性，否则 UI 行为反直觉</li> <li>提交表单时，同名 <code><select multiple></code> 会生成多个同名参数（如 <code>fruit=apple&fruit=banana</code>），后端要按数组接收</li> <li>用 JS 设置多选状态：不能只改 <code>option.selected = true</code>，还要确保 <code>select</code> 本身有 <code>multiple</code> 属性，否则只会切换唯一选中项</li> </ul><h3><code><input type="file" multiple></code> 的实际限制</h3> <p>虽然加了 <code>multiple</code> 就能选多个文件，但浏览器对“一次选择”的定义不同：Chrome/Firefox 允许 Ctrl/Cmd 多选或框选，Safari 在某些版本里只支持逐个添加（点一次“打开”选一个，再点一次追加），不是所有用户都能顺畅操作。</p> <p>更关键的是，<code>input.files</code> 是只读的 <code>FileList</code>，你没法手动往里 push 文件；想预填充或合并多次选择？做不到。只能靠 JS 拼接多个 <code>FileList</code>（需转成数组再 concat）或者用 <code>DataTransfer</code> 构造新对象（兼容性差）。</p> <ul><li>无法通过 JS 直接设置 <code>input.files</code>，只能由用户触发选择</li> <li>移动端 Android Chrome 支持 <code>multiple</code>，但 iOS Safari 一直不支持（直到 iOS 16.4 才部分放开），旧项目要降级处理</li> <li><code>accept</code> 属性和 <code>multiple</code> 可共存，比如 <code>accept=".pdf,.docx" multiple</code>，但不能保证用户只选这些类型，只是过滤弹窗里的文件类型</li> </ul><h3>为什么有时候加了 <code>multiple</code> 却没反应</h3> <p>最常被忽略的是 CSS 干扰：<code>select[multiple]</code> 默认是滚动列表样式，但如果写了 <code>select { height: 40px; }</code> 这类固定高度，会把选项全压扁看不见，看起来像“没生效”。另外，某些 UI 框架（如 Bootstrap 5 的 form-select）默认禁用原生 <code>multiple</code> 样式，改用 JS 模拟，此时加原生属性无效。</p> <p>还有种情况是服务端问题：PHP 的 <code>$_FILES</code> 数组结构在多文件上传时是嵌套的（<code>['name' => ['a.pdf', 'b.jpg'], 'tmp_name' => [...]]</code>），如果代码还按单文件逻辑取 <code>$_FILES['upload']['tmp_name']</code>，就会漏掉其余文件。</p> <ul><li>检查渲染后的 <code>select</code> 是否真有 <code>multiple</code> 属性（DevTools 查看），而不是被 JS 动态删了</li> <li>禁用 CSS 重置，确认原生样式是否被覆盖</li> <li>后端解析前先 <code>var_dump($_FILES)</code> 或 <code>console.log(req.files)</code>，看清结构再写逻辑</li> </ul> 事情说清了就结束<p>到这里，我们也就讲完了《HTML多选属性设置方法详解》的内容了。个人认为，基础知识的学习和巩固，是为了更好的将其运用到项目中，欢迎关注golang学习网公众号，带你了解更多关于的知识点！</p> </div> <div class="labsList"> </div> </div> <!-- 最新阅读 --> <div class="contBoxNor"> <div class="contTit"> <div class="tit">相关阅读</div> <a href="/articlelist.html" class="more">更多></a> </div> <ul class="latestReadList"> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 1年前 | <a href="javascript:;" class="aLightGray" title="提升">提升</a> <a href="javascript:;" class="aLightGray" title="箭头函数">箭头函数</a> <a href="javascript:;" class="aLightGray" title="函数表达式">函数表达式</a> <a href="javascript:;" class="aLightGray" title="函数声明">函数声明</a> <a href="javascript:;" class="aLightGray" title="Function构造函数">Function构造函数</a> </div> <div class="tit lineOverflow"><a href="/article/207000.html" title="JavaScript函数定义及示例详解" class="aBlack">JavaScript函数定义及示例详解</a></div> <div class="opt"> <span><i class="view"></i>502</span> <span class="collectBtn user_collection" data-id="207000" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 1个月前 | </div> <div class="tit lineOverflow"><a href="/article/619053.html" title="CSS变量简化按钮悬停效果技巧" class="aBlack">CSS变量简化按钮悬停效果技巧</a></div> <div class="opt"> <span><i class="view"></i>501</span> <span class="collectBtn user_collection" data-id="619053" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 1个月前 | </div> <div class="tit lineOverflow"><a href="/article/618916.html" title="JavaScript符号类型详解与应用" class="aBlack">JavaScript符号类型详解与应用</a></div> <div class="opt"> <span><i class="view"></i>501</span> <span class="collectBtn user_collection" data-id="618916" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 1个月前 | </div> <div class="tit lineOverflow"><a href="/article/612539.html" title="HTML剪贴板复制粘贴怎么用" class="aBlack">HTML剪贴板复制粘贴怎么用</a></div> <div class="opt"> <span><i class="view"></i>501</span> <span class="collectBtn user_collection" data-id="612539" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 1个月前 | </div> <div class="tit lineOverflow"><a href="/article/611774.html" title="data-*属性详解：HTML数据存储与DOM操作技巧" class="aBlack">data-*属性详解：HTML数据存储与DOM操作技巧</a></div> <div class="opt"> <span><i class="view"></i>501</span> <span class="collectBtn user_collection" data-id="611774" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> </ul> </div> <!-- 最新阅读 --> <div class="contBoxNor"> <div class="contTit"> <div class="tit">最新阅读</div> <a href="/articlelist.html" class="more">更多></a> </div> <ul class="latestReadList"> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 3天前 | <a href="/articletag/243_new_0_1.html" class="aLightGray" title="前端">前端</a> · <a href="/articletag/729_new_0_1.html" class="aLightGray" title="性能优化">性能优化</a> · <a href="/articletag/2774_new_0_1.html" class="aLightGray" title="dom">dom</a> · <a href="/articletag/39783_new_0_1.html" class="aLightGray" title="虚拟列表">虚拟列表</a> · <a href="javascript:;" class="aLightGray" title="JavaScript">JavaScript</a> <a href="javascript:;" class="aLightGray" title="前端">前端</a> <a href="javascript:;" class="aLightGray" title="滚动性能">滚动性能</a> <a href="javascript:;" class="aLightGray" title="虚拟列表">虚拟列表</a> <a href="javascript:;" class="aLightGray" title="长列表优化">长列表优化</a> <a href="javascript:;" class="aLightGray" title="DOM性能">DOM性能</a> </div> <div class="tit lineOverflow"><a href="/article/620135.html" title="前端长列表卡顿怎么优化：从全量 DOM 到虚拟列表架构" class="aBlack">前端长列表卡顿怎么优化：从全量 DOM 到虚拟列表架构</a></div> <div class="opt"> <span><i class="view"></i>260</span> <span class="collectBtn user_collection" data-id="620135" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 4天前 | <a href="/articletag/243_new_0_1.html" class="aLightGray" title="前端">前端</a> · <a href="/articletag/4701_new_0_1.html" class="aLightGray" title="javascript">javascript</a> · <a href="/articletag/39917_new_0_1.html" class="aLightGray" title="AbortController">AbortController</a> · <a href="/articletag/39920_new_0_1.html" class="aLightGray" title="表单提交">表单提交</a> · <a href="javascript:;" class="aLightGray" title="AbortController">AbortController</a> <a href="javascript:;" class="aLightGray" title="旧响应覆盖">旧响应覆盖</a> <a href="javascript:;" class="aLightGray" title="前端重复提交">前端重复提交</a> <a href="javascript:;" class="aLightGray" title="loading锁">loading锁</a> <a href="javascript:;" class="aLightGray" title="fetch取消">fetch取消</a> <a href="javascript:;" class="aLightGray" title="按钮防抖">按钮防抖</a> </div> <div class="tit lineOverflow"><a href="/article/620123.html" title="前端按钮重复提交怎么办：loading 锁和 AbortController 最小配方" class="aBlack">前端按钮重复提交怎么办：loading 锁和 AbortController 最小配方</a></div> <div class="opt"> <span><i class="view"></i>442</span> <span class="collectBtn user_collection" data-id="620123" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 5天前 | <a href="/articletag/243_new_0_1.html" class="aLightGray" title="前端">前端</a> · <a href="/articletag/322_new_0_1.html" class="aLightGray" title="缓存">缓存</a> · <a href="/articletag/14884_new_0_1.html" class="aLightGray" title="Service Worker">Service Worker</a> · <a href="/articletag/40077_new_0_1.html" class="aLightGray" title="白屏">白屏</a> · <a href="/articletag/40078_new_0_1.html" class="aLightGray" title="发布故障">发布故障</a> · <a href="javascript:;" class="aLightGray" title="缓存策略">缓存策略</a> <a href="javascript:;" class="aLightGray" title="前端白屏">前端白屏</a> <a href="javascript:;" class="aLightGray" title="Service Worker">Service Worker</a> <a href="javascript:;" class="aLightGray" title="CacheStorage">CacheStorage</a> <a href="javascript:;" class="aLightGray" title="资源404">资源404</a> <a href="javascript:;" class="aLightGray" title="发布回滚">发布回滚</a> </div> <div class="tit lineOverflow"><a href="/article/620112.html" title="前端发布后白屏复盘：Service Worker 缓存旧入口导致 JS 资源 404" class="aBlack">前端发布后白屏复盘：Service Worker 缓存旧入口导致 JS 资源 404</a></div> <div class="opt"> <span><i class="view"></i>469</span> <span class="collectBtn user_collection" data-id="620112" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 5天前 | <a href="/articletag/2436_new_0_1.html" class="aLightGray" title="异步任务">异步任务</a> · <a href="/articletag/5401_new_0_1.html" class="aLightGray" title="前端开发">前端开发</a> · <a href="/articletag/39770_new_0_1.html" class="aLightGray" title="接口设计">接口设计</a> · <a href="/articletag/40045_new_0_1.html" class="aLightGray" title="后台系统">后台系统</a> · <a href="/articletag/40046_new_0_1.html" class="aLightGray" title="批量导出">批量导出</a> · <a href="javascript:;" class="aLightGray" title="异步任务">异步任务</a> <a href="javascript:;" class="aLightGray" title="文件下载">文件下载</a> <a href="javascript:;" class="aLightGray" title="接口设计">接口设计</a> <a href="javascript:;" class="aLightGray" title="前端导出">前端导出</a> <a href="javascript:;" class="aLightGray" title="状态查询">状态查询</a> <a href="javascript:;" class="aLightGray" title="报表导出">报表导出</a> </div> <div class="tit lineOverflow"><a href="/article/620092.html" title="前端批量导出接口怎么设计：异步任务、状态查询和下载链接" class="aBlack">前端批量导出接口怎么设计：异步任务、状态查询和下载链接</a></div> <div class="opt"> <span><i class="view"></i>296</span> <span class="collectBtn user_collection" data-id="620092" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 5天前 | <a href="/articletag/5401_new_0_1.html" class="aLightGray" title="前端开发">前端开发</a> · <a href="/articletag/39813_new_0_1.html" class="aLightGray" title="localStorage">localStorage</a> · <a href="/articletag/40043_new_0_1.html" class="aLightGray" title="表格配置">表格配置</a> · <a href="/articletag/40044_new_0_1.html" class="aLightGray" title="用户偏好">用户偏好</a> · <a href="/articletag/40045_new_0_1.html" class="aLightGray" title="后台系统">后台系统</a> · <a href="javascript:;" class="aLightGray" title="用户偏好">用户偏好</a> <a href="javascript:;" class="aLightGray" title="localStorage">localStorage</a> <a href="javascript:;" class="aLightGray" title="前端表格">前端表格</a> <a href="javascript:;" class="aLightGray" title="列配置">列配置</a> <a href="javascript:;" class="aLightGray" title="可见列">可见列</a> <a href="javascript:;" class="aLightGray" title="列宽保存">列宽保存</a> </div> <div class="tit lineOverflow"><a href="/article/620091.html" title="前端表格列设置刷新后丢失怎么办：可见列、列宽和顺序这样保存" class="aBlack">前端表格列设置刷新后丢失怎么办：可见列、列宽和顺序这样保存</a></div> <div class="opt"> <span><i class="view"></i>351</span> <span class="collectBtn user_collection" data-id="620091" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 6天前 | <a href="/articletag/1017_new_0_1.html" class="aLightGray" title="websocket">websocket</a> · <a href="/articletag/5401_new_0_1.html" class="aLightGray" title="前端开发">前端开发</a> · <a href="/articletag/27659_new_0_1.html" class="aLightGray" title="sse">sse</a> · <a href="/articletag/40036_new_0_1.html" class="aLightGray" title="实时通知">实时通知</a> · <a href="/articletag/40037_new_0_1.html" class="aLightGray" title="方案选型">方案选型</a> · <a href="javascript:;" class="aLightGray" title="websocket">websocket</a> <a href="javascript:;" class="aLightGray" title="消息推送">消息推送</a> <a href="javascript:;" class="aLightGray" title="EventSource">EventSource</a> <a href="javascript:;" class="aLightGray" title="SSE">SSE</a> <a href="javascript:;" class="aLightGray" title="前端实时通知">前端实时通知</a> <a href="javascript:;" class="aLightGray" title="短轮询">短轮询</a> </div> <div class="tit lineOverflow"><a href="/article/620087.html" title="前端实时通知方案选型：短轮询、SSE、WebSocket 怎么选" class="aBlack">前端实时通知方案选型：短轮询、SSE、WebSocket 怎么选</a></div> <div class="opt"> <span><i class="view"></i>498</span> <span class="collectBtn user_collection" data-id="620087" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 6天前 | <a href="/articletag/243_new_0_1.html" class="aLightGray" title="前端">前端</a> · <a href="/articletag/40002_new_0_1.html" class="aLightGray" title="接口排查">接口排查</a> · <a href="/articletag/40021_new_0_1.html" class="aLightGray" title="运维手册">运维手册</a> · <a href="/articletag/40024_new_0_1.html" class="aLightGray" title="性能告警">性能告警</a> · <a href="javascript:;" class="aLightGray" title="前端">前端</a> <a href="javascript:;" class="aLightGray" title="AbortController">AbortController</a> <a href="javascript:;" class="aLightGray" title="接口超时">接口超时</a> <a href="javascript:;" class="aLightGray" title="Network瀑布图">Network瀑布图</a> <a href="javascript:;" class="aLightGray" title="降级回滚">降级回滚</a> <a href="javascript:;" class="aLightGray" title="线上告警">线上告警</a> </div> <div class="tit lineOverflow"><a href="/article/620079.html" title="前端接口超时告警运行手册：从瀑布图到降级回滚" class="aBlack">前端接口超时告警运行手册：从瀑布图到降级回滚</a></div> <div class="opt"> <span><i class="view"></i>287</span> <span class="collectBtn user_collection" data-id="620079" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 6天前 | <a href="/articletag/243_new_0_1.html" class="aLightGray" title="前端">前端</a> · <a href="/articletag/4729_new_0_1.html" class="aLightGray" title="css">css</a> · <a href="/articletag/9935_new_0_1.html" class="aLightGray" title="sticky">sticky</a> · <a href="/articletag/40022_new_0_1.html" class="aLightGray" title="布局调试">布局调试</a> · <a href="javascript:;" class="aLightGray" title="CSS">CSS</a> <a href="javascript:;" class="aLightGray" title="Overflow">Overflow</a> <a href="javascript:;" class="aLightGray" title="position sticky">position sticky</a> <a href="javascript:;" class="aLightGray" title="滚动容器">滚动容器</a> <a href="javascript:;" class="aLightGray" title="前端调试">前端调试</a> <a href="javascript:;" class="aLightGray" title="吸顶布局">吸顶布局</a> </div> <div class="tit lineOverflow"><a href="/article/620076.html" title="CSS sticky 不生效排查清单：从 top、overflow 到滚动容器逐层定位" class="aBlack">CSS sticky 不生效排查清单：从 top、overflow 到滚动容器逐层定位</a></div> <div class="opt"> <span><i class="view"></i>179</span> <span class="collectBtn user_collection" data-id="620076" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 1星期前 | <a href="/articletag/243_new_0_1.html" class="aLightGray" title="前端">前端</a> · <a href="/articletag/652_new_0_1.html" class="aLightGray" title="静态资源">静态资源</a> · <a href="/articletag/5322_new_0_1.html" class="aLightGray" title="cdn">cdn</a> · <a href="/articletag/40011_new_0_1.html" class="aLightGray" title="云部署">云部署</a> · <a href="javascript:;" class="aLightGray" title="对象存储">对象存储</a> <a href="javascript:;" class="aLightGray" title="静态资源">静态资源</a> <a href="javascript:;" class="aLightGray" title="缓存策略">缓存策略</a> <a href="javascript:;" class="aLightGray" title="cdn">cdn</a> <a href="javascript:;" class="aLightGray" title="前端部署">前端部署</a> <a href="javascript:;" class="aLightGray" title="容器服务">容器服务</a> </div> <div class="tit lineOverflow"><a href="/article/620069.html" title="前端静态资源上云部署选型：对象存储、CDN 和容器服务怎么选" class="aBlack">前端静态资源上云部署选型：对象存储、CDN 和容器服务怎么选</a></div> <div class="opt"> <span><i class="view"></i>433</span> <span class="collectBtn user_collection" data-id="620069" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 1星期前 | <a href="/articletag/243_new_0_1.html" class="aLightGray" title="前端">前端</a> · <a href="/articletag/39982_new_0_1.html" class="aLightGray" title="接口联调">接口联调</a> · <a href="/articletag/39989_new_0_1.html" class="aLightGray" title="表单交互">表单交互</a> · <a href="/articletag/39990_new_0_1.html" class="aLightGray" title="重复提交">重复提交</a> · <a href="/articletag/39991_new_0_1.html" class="aLightGray" title="用户体验">用户体验</a> · <a href="javascript:;" class="aLightGray" title="前端">前端</a> <a href="javascript:;" class="aLightGray" title="表单提交">表单提交</a> <a href="javascript:;" class="aLightGray" title="重复请求">重复请求</a> <a href="javascript:;" class="aLightGray" title="AbortController">AbortController</a> <a href="javascript:;" class="aLightGray" title="幂等键">幂等键</a> <a href="javascript:;" class="aLightGray" title="按钮禁用">按钮禁用</a> </div> <div class="tit lineOverflow"><a href="/article/620045.html" title="前端表单重复提交防护工作流：从按钮状态到请求取消和幂等键" class="aBlack">前端表单重复提交防护工作流：从按钮状态到请求取消和幂等键</a></div> <div class="opt"> <span><i class="view"></i>374</span> <span class="collectBtn user_collection" data-id="620045" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 2星期前 | <a href="/articletag/243_new_0_1.html" class="aLightGray" title="前端">前端</a> · <a href="/articletag/4720_new_0_1.html" class="aLightGray" title="cors">cors</a> · <a href="/articletag/39980_new_0_1.html" class="aLightGray" title="跨域排查">跨域排查</a> · <a href="/articletag/39981_new_0_1.html" class="aLightGray" title="浏览器网络">浏览器网络</a> · <a href="/articletag/39982_new_0_1.html" class="aLightGray" title="接口联调">接口联调</a> · <a href="javascript:;" class="aLightGray" title="前端">前端</a> <a href="javascript:;" class="aLightGray" title="cors">cors</a> <a href="javascript:;" class="aLightGray" title="请求头">请求头</a> <a href="javascript:;" class="aLightGray" title="跨域">跨域</a> <a href="javascript:;" class="aLightGray" title="预检请求">预检请求</a> <a href="javascript:;" class="aLightGray" title="Options">Options</a> </div> <div class="tit lineOverflow"><a href="/article/620039.html" title="前端 CORS 预检失败排查流程：从请求头到网关响应" class="aBlack">前端 CORS 预检失败排查流程：从请求头到网关响应</a></div> <div class="opt"> <span><i class="view"></i>422</span> <span class="collectBtn user_collection" data-id="620039" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 2星期前 | <a href="/articletag/243_new_0_1.html" class="aLightGray" title="前端">前端</a> · <a href="/articletag/4729_new_0_1.html" class="aLightGray" title="css">css</a> · <a href="/articletag/9935_new_0_1.html" class="aLightGray" title="sticky">sticky</a> · <a href="/articletag/39972_new_0_1.html" class="aLightGray" title="布局排查">布局排查</a> · <a href="/articletag/39973_new_0_1.html" class="aLightGray" title="滚动容器">滚动容器</a> · <a href="javascript:;" class="aLightGray" title="CSS">CSS</a> <a href="javascript:;" class="aLightGray" title="前端">前端</a> <a href="javascript:;" class="aLightGray" title="Overflow">Overflow</a> <a href="javascript:;" class="aLightGray" title="position sticky">position sticky</a> <a href="javascript:;" class="aLightGray" title="滚动容器">滚动容器</a> <a href="javascript:;" class="aLightGray" title="吸顶失效">吸顶失效</a> </div> <div class="tit lineOverflow"><a href="/article/620035.html" title="前端 position sticky 不生效排查：从滚动容器到 overflow 限制" class="aBlack">前端 position sticky 不生效排查：从滚动容器到 overflow 限制</a></div> <div class="opt"> <span><i class="view"></i>449</span> <span class="collectBtn user_collection" data-id="620035" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> </ul> </div> <!-- 课程推荐 --> <div class="contBoxNor"> <div class="contTit"> <div class="tit">课程推荐</div> <a href="/courselist.html" class="more">更多></a> </div> <ul class="classRecomList"> <li> <a href="/course/9.html" title="前端进阶之JavaScript设计模式" class="img_box"> <img src="/uploads/20221222/52fd0f23a454c71029c2c72d206ed815.jpg" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="前端进阶之JavaScript设计模式"> </a> <dl> <dt class="lineOverflow"> 前端进阶之JavaScript设计模式 </dt> <dd class="cont1 lineOverflow">设计模式是开发人员在软件开发过程中面临一般问题时的解决方案，代表了最佳的实践。本课程的主打内容包括JS常见设计模式以及具体应用场景，打造一站式知识长龙服务，适合有JS基础的同学学习。</dd> <dd class="cont2"> <a href="/course/9.html" title="前端进阶之JavaScript设计模式" class="toStudy">立即学习</a> <span>543次学习</span> </dd> </dl> </li> <li> <a href="/course/2.html" title="GO语言核心编程课程" class="img_box"> <img src="/uploads/20221221/634ad7404159bfefc6a54a564d437b5f.png" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="GO语言核心编程课程"> </a> <dl> <dt class="lineOverflow"> GO语言核心编程课程 </dt> <dd class="cont1 lineOverflow">本课程采用真实案例，全面具体可落地，从理论到实践，一步一步将GO核心编程技术、编程思想、底层实现融会贯通，使学习者贴近时代脉搏，做IT互联网时代的弄潮儿。</dd> <dd class="cont2"> <a href="/course/2.html" title="GO语言核心编程课程" class="toStudy">立即学习</a> <span>516次学习</span> </dd> </dl> </li> <li> <a href="/course/74.html" title="简单聊聊mysql8与网络通信" class="img_box"> <img src="/uploads/20240103/bad35fe14edbd214bee16f88343ac57c.png" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="简单聊聊mysql8与网络通信"> </a> <dl> <dt class="lineOverflow"> 简单聊聊mysql8与网络通信 </dt> <dd class="cont1 lineOverflow">如有问题加微信：Le-studyg；在课程中，我们将首先介绍MySQL8的新特性，包括性能优化、安全增强、新数据类型等，帮助学生快速熟悉MySQL8的最新功能。接着，我们将深入解析MySQL的网络通信机制，包括协议、连接管理、数据传输等，让</dd> <dd class="cont2"> <a href="/course/74.html" title="简单聊聊mysql8与网络通信" class="toStudy">立即学习</a> <span>500次学习</span> </dd> </dl> </li> <li> <a href="/course/57.html" title="JavaScript正则表达式基础与实战" class="img_box"> <img src="/uploads/20221226/bbe4083bb3cb0dd135fb02c31c3785fb.jpg" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="JavaScript正则表达式基础与实战"> </a> <dl> <dt class="lineOverflow"> JavaScript正则表达式基础与实战 </dt> <dd class="cont1 lineOverflow">在任何一门编程语言中,正则表达式,都是一项重要的知识,它提供了高效的字符串匹配与捕获机制,可以极大的简化程序设计。</dd> <dd class="cont2"> <a href="/course/57.html" title="JavaScript正则表达式基础与实战" class="toStudy">立即学习</a> <span>487次学习</span> </dd> </dl> </li> <li> <a href="/course/28.html" title="从零制作响应式网站—Grid布局" class="img_box"> <img src="/uploads/20221223/ac110f88206daeab6c0cf38ebf5fe9ed.jpg" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="从零制作响应式网站—Grid布局"> </a> <dl> <dt class="lineOverflow"> 从零制作响应式网站—Grid布局 </dt> <dd class="cont1 lineOverflow">本系列教程将展示从零制作一个假想的网络科技公司官网，分为导航，轮播，关于我们，成功案例，服务流程，团队介绍，数据部分，公司动态，底部信息等内容区块。网站整体采用CSSGrid布局，支持响应式，有流畅过渡和展现动画。</dd> <dd class="cont2"> <a href="/course/28.html" title="从零制作响应式网站—Grid布局" class="toStudy">立即学习</a> <span>485次学习</span> </dd> </dl> </li> </ul> </div> </div> <!-- footer --> <div class="footer"> <ul> <li ><a href="/" class="aLightGray"><em class="navIcon navIconHome"></em><span>首页</span></a></li> <li class="curr"><a href="/articlelist.html" class="aLightGray"><em class="navIcon navIconRead"></em><span>阅读</span></a></li> <li ><a href="/courselist.html" class="aLightGray"><em class="navIcon navIconCourse"></em><span>课程</span></a></li> <li ><a href="/ai.html" class="aLightGray"><em class="navIcon navIconAi"></em><span>AI助手</span></a></li> <li ><a href="/user.html" class="aLightGray"><em class="navIcon navIconUser"></em><span>我的</span></a></li> </ul> </div> <script src="/assets/js/frontend/common.js" defer></script> <script src="/assets/js/juejin-theme.js?v=20260613b" defer></script> <script> var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?3dc5666f6478c7bf39cd5c91e597423d"; hm.async = true; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })(); </script> </body> </html>
</code>）加了也无效，浏览器直接忽略。</p> <p>常见错误现象：给 <code><input type="email"></code> 加 <code>multiple</code>，以为能输多个邮箱——不行，语法合法但无行为变化；用户仍只能填一个值，JS 读取的 <code>value</code> 也不会变。</p> <ul><li><code><input type="file" multiple></code>：允许用户一次选多个文件，<code>files</code> 属性返回 <code>FileList</code> 对象</li> <li><code><select multiple></code>：启用多选下拉，用户按 Ctrl/Cmd 或拖选，<code>selectedOptions</code> 返回多个 <code>HTMLOptionElement</code></li> <li>不支持的元素加 <code>multiple</code>：不报错，但没效果，别白费劲</li> </ul><h3><code>multiple</code> 在 <code><select></code> 中怎么用才不出错</h3> <p>加了 <code>multiple</code> 后，<code><select></code> 的交互逻辑和单选完全不同：默认不显示选项，必须设置 <code>size</code>（如 <code>size="4"</code>）才能看到多个选项；否则只显示一行，用户根本不知道能多选。</p> <p>另一个坑是 JS 获取值的方式：不能用 <code>select.value</code>（它只返回第一个选中项的 <code>value</code>），得遍历 <code>select.selectedOptions</code> 或用 <code>Array.from(select.options).filter(opt => opt.selected)</code>。</p> <ul><li>必须显式设 <code>size</code> 属性，否则 UI 行为反直觉</li> <li>提交表单时，同名 <code><select multiple></code> 会生成多个同名参数（如 <code>fruit=apple&fruit=banana</code>），后端要按数组接收</li> <li>用 JS 设置多选状态：不能只改 <code>option.selected = true</code>，还要确保 <code>select</code> 本身有 <code>multiple</code> 属性，否则只会切换唯一选中项</li> </ul><h3><code><input type="file" multiple></code> 的实际限制</h3> <p>虽然加了 <code>multiple</code> 就能选多个文件，但浏览器对“一次选择”的定义不同：Chrome/Firefox 允许 Ctrl/Cmd 多选或框选，Safari 在某些版本里只支持逐个添加（点一次“打开”选一个，再点一次追加），不是所有用户都能顺畅操作。</p> <p>更关键的是，<code>input.files</code> 是只读的 <code>FileList</code>，你没法手动往里 push 文件；想预填充或合并多次选择？做不到。只能靠 JS 拼接多个 <code>FileList</code>（需转成数组再 concat）或者用 <code>DataTransfer</code> 构造新对象（兼容性差）。</p> <ul><li>无法通过 JS 直接设置 <code>input.files</code>，只能由用户触发选择</li> <li>移动端 Android Chrome 支持 <code>multiple</code>，但 iOS Safari 一直不支持（直到 iOS 16.4 才部分放开），旧项目要降级处理</li> <li><code>accept</code> 属性和 <code>multiple</code> 可共存，比如 <code>accept=".pdf,.docx" multiple</code>，但不能保证用户只选这些类型，只是过滤弹窗里的文件类型</li> </ul><h3>为什么有时候加了 <code>multiple</code> 却没反应</h3> <p>最常被忽略的是 CSS 干扰：<code>select[multiple]</code> 默认是滚动列表样式，但如果写了 <code>select { height: 40px; }</code> 这类固定高度，会把选项全压扁看不见，看起来像“没生效”。另外，某些 UI 框架（如 Bootstrap 5 的 form-select）默认禁用原生 <code>multiple</code> 样式，改用 JS 模拟，此时加原生属性无效。</p> <p>还有种情况是服务端问题：PHP 的 <code>$_FILES</code> 数组结构在多文件上传时是嵌套的（<code>['name' => ['a.pdf', 'b.jpg'], 'tmp_name' => [...]]</code>），如果代码还按单文件逻辑取 <code>$_FILES['upload']['tmp_name']</code>，就会漏掉其余文件。</p> <ul><li>检查渲染后的 <code>select</code> 是否真有 <code>multiple</code> 属性（DevTools 查看），而不是被 JS 动态删了</li> <li>禁用 CSS 重置，确认原生样式是否被覆盖</li> <li>后端解析前先 <code>var_dump($_FILES)</code> 或 <code>console.log(req.files)</code>，看清结构再写逻辑</li> </ul> 事情说清了就结束<p>到这里，我们也就讲完了《HTML多选属性设置方法详解》的内容了。个人认为，基础知识的学习和巩固，是为了更好的将其运用到项目中，欢迎关注golang学习网公众号，带你了解更多关于的知识点！</p> </div> <div class="labsList"> </div> </div> <!-- 最新阅读 --> <div class="contBoxNor"> <div class="contTit"> <div class="tit">相关阅读</div> <a href="/articlelist.html" class="more">更多></a> </div> <ul class="latestReadList"> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 1年前 | <a href="javascript:;" class="aLightGray" title="提升">提升</a> <a href="javascript:;" class="aLightGray" title="箭头函数">箭头函数</a> <a href="javascript:;" class="aLightGray" title="函数表达式">函数表达式</a> <a href="javascript:;" class="aLightGray" title="函数声明">函数声明</a> <a href="javascript:;" class="aLightGray" title="Function构造函数">Function构造函数</a> </div> <div class="tit lineOverflow"><a href="/article/207000.html" title="JavaScript函数定义及示例详解" class="aBlack">JavaScript函数定义及示例详解</a></div> <div class="opt"> <span><i class="view"></i>502</span> <span class="collectBtn user_collection" data-id="207000" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 1个月前 | </div> <div class="tit lineOverflow"><a href="/article/619053.html" title="CSS变量简化按钮悬停效果技巧" class="aBlack">CSS变量简化按钮悬停效果技巧</a></div> <div class="opt"> <span><i class="view"></i>501</span> <span class="collectBtn user_collection" data-id="619053" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 1个月前 | </div> <div class="tit lineOverflow"><a href="/article/618916.html" title="JavaScript符号类型详解与应用" class="aBlack">JavaScript符号类型详解与应用</a></div> <div class="opt"> <span><i class="view"></i>501</span> <span class="collectBtn user_collection" data-id="618916" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 1个月前 | </div> <div class="tit lineOverflow"><a href="/article/612539.html" title="HTML剪贴板复制粘贴怎么用" class="aBlack">HTML剪贴板复制粘贴怎么用</a></div> <div class="opt"> <span><i class="view"></i>501</span> <span class="collectBtn user_collection" data-id="612539" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 1个月前 | </div> <div class="tit lineOverflow"><a href="/article/611774.html" title="data-*属性详解：HTML数据存储与DOM操作技巧" class="aBlack">data-*属性详解：HTML数据存储与DOM操作技巧</a></div> <div class="opt"> <span><i class="view"></i>501</span> <span class="collectBtn user_collection" data-id="611774" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> </ul> </div> <!-- 最新阅读 --> <div class="contBoxNor"> <div class="contTit"> <div class="tit">最新阅读</div> <a href="/articlelist.html" class="more">更多></a> </div> <ul class="latestReadList"> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 3天前 | <a href="/articletag/243_new_0_1.html" class="aLightGray" title="前端">前端</a> · <a href="/articletag/729_new_0_1.html" class="aLightGray" title="性能优化">性能优化</a> · <a href="/articletag/2774_new_0_1.html" class="aLightGray" title="dom">dom</a> · <a href="/articletag/39783_new_0_1.html" class="aLightGray" title="虚拟列表">虚拟列表</a> · <a href="javascript:;" class="aLightGray" title="JavaScript">JavaScript</a> <a href="javascript:;" class="aLightGray" title="前端">前端</a> <a href="javascript:;" class="aLightGray" title="滚动性能">滚动性能</a> <a href="javascript:;" class="aLightGray" title="虚拟列表">虚拟列表</a> <a href="javascript:;" class="aLightGray" title="长列表优化">长列表优化</a> <a href="javascript:;" class="aLightGray" title="DOM性能">DOM性能</a> </div> <div class="tit lineOverflow"><a href="/article/620135.html" title="前端长列表卡顿怎么优化：从全量 DOM 到虚拟列表架构" class="aBlack">前端长列表卡顿怎么优化：从全量 DOM 到虚拟列表架构</a></div> <div class="opt"> <span><i class="view"></i>260</span> <span class="collectBtn user_collection" data-id="620135" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 4天前 | <a href="/articletag/243_new_0_1.html" class="aLightGray" title="前端">前端</a> · <a href="/articletag/4701_new_0_1.html" class="aLightGray" title="javascript">javascript</a> · <a href="/articletag/39917_new_0_1.html" class="aLightGray" title="AbortController">AbortController</a> · <a href="/articletag/39920_new_0_1.html" class="aLightGray" title="表单提交">表单提交</a> · <a href="javascript:;" class="aLightGray" title="AbortController">AbortController</a> <a href="javascript:;" class="aLightGray" title="旧响应覆盖">旧响应覆盖</a> <a href="javascript:;" class="aLightGray" title="前端重复提交">前端重复提交</a> <a href="javascript:;" class="aLightGray" title="loading锁">loading锁</a> <a href="javascript:;" class="aLightGray" title="fetch取消">fetch取消</a> <a href="javascript:;" class="aLightGray" title="按钮防抖">按钮防抖</a> </div> <div class="tit lineOverflow"><a href="/article/620123.html" title="前端按钮重复提交怎么办：loading 锁和 AbortController 最小配方" class="aBlack">前端按钮重复提交怎么办：loading 锁和 AbortController 最小配方</a></div> <div class="opt"> <span><i class="view"></i>442</span> <span class="collectBtn user_collection" data-id="620123" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 5天前 | <a href="/articletag/243_new_0_1.html" class="aLightGray" title="前端">前端</a> · <a href="/articletag/322_new_0_1.html" class="aLightGray" title="缓存">缓存</a> · <a href="/articletag/14884_new_0_1.html" class="aLightGray" title="Service Worker">Service Worker</a> · <a href="/articletag/40077_new_0_1.html" class="aLightGray" title="白屏">白屏</a> · <a href="/articletag/40078_new_0_1.html" class="aLightGray" title="发布故障">发布故障</a> · <a href="javascript:;" class="aLightGray" title="缓存策略">缓存策略</a> <a href="javascript:;" class="aLightGray" title="前端白屏">前端白屏</a> <a href="javascript:;" class="aLightGray" title="Service Worker">Service Worker</a> <a href="javascript:;" class="aLightGray" title="CacheStorage">CacheStorage</a> <a href="javascript:;" class="aLightGray" title="资源404">资源404</a> <a href="javascript:;" class="aLightGray" title="发布回滚">发布回滚</a> </div> <div class="tit lineOverflow"><a href="/article/620112.html" title="前端发布后白屏复盘：Service Worker 缓存旧入口导致 JS 资源 404" class="aBlack">前端发布后白屏复盘：Service Worker 缓存旧入口导致 JS 资源 404</a></div> <div class="opt"> <span><i class="view"></i>469</span> <span class="collectBtn user_collection" data-id="620112" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 5天前 | <a href="/articletag/2436_new_0_1.html" class="aLightGray" title="异步任务">异步任务</a> · <a href="/articletag/5401_new_0_1.html" class="aLightGray" title="前端开发">前端开发</a> · <a href="/articletag/39770_new_0_1.html" class="aLightGray" title="接口设计">接口设计</a> · <a href="/articletag/40045_new_0_1.html" class="aLightGray" title="后台系统">后台系统</a> · <a href="/articletag/40046_new_0_1.html" class="aLightGray" title="批量导出">批量导出</a> · <a href="javascript:;" class="aLightGray" title="异步任务">异步任务</a> <a href="javascript:;" class="aLightGray" title="文件下载">文件下载</a> <a href="javascript:;" class="aLightGray" title="接口设计">接口设计</a> <a href="javascript:;" class="aLightGray" title="前端导出">前端导出</a> <a href="javascript:;" class="aLightGray" title="状态查询">状态查询</a> <a href="javascript:;" class="aLightGray" title="报表导出">报表导出</a> </div> <div class="tit lineOverflow"><a href="/article/620092.html" title="前端批量导出接口怎么设计：异步任务、状态查询和下载链接" class="aBlack">前端批量导出接口怎么设计：异步任务、状态查询和下载链接</a></div> <div class="opt"> <span><i class="view"></i>296</span> <span class="collectBtn user_collection" data-id="620092" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 5天前 | <a href="/articletag/5401_new_0_1.html" class="aLightGray" title="前端开发">前端开发</a> · <a href="/articletag/39813_new_0_1.html" class="aLightGray" title="localStorage">localStorage</a> · <a href="/articletag/40043_new_0_1.html" class="aLightGray" title="表格配置">表格配置</a> · <a href="/articletag/40044_new_0_1.html" class="aLightGray" title="用户偏好">用户偏好</a> · <a href="/articletag/40045_new_0_1.html" class="aLightGray" title="后台系统">后台系统</a> · <a href="javascript:;" class="aLightGray" title="用户偏好">用户偏好</a> <a href="javascript:;" class="aLightGray" title="localStorage">localStorage</a> <a href="javascript:;" class="aLightGray" title="前端表格">前端表格</a> <a href="javascript:;" class="aLightGray" title="列配置">列配置</a> <a href="javascript:;" class="aLightGray" title="可见列">可见列</a> <a href="javascript:;" class="aLightGray" title="列宽保存">列宽保存</a> </div> <div class="tit lineOverflow"><a href="/article/620091.html" title="前端表格列设置刷新后丢失怎么办：可见列、列宽和顺序这样保存" class="aBlack">前端表格列设置刷新后丢失怎么办：可见列、列宽和顺序这样保存</a></div> <div class="opt"> <span><i class="view"></i>351</span> <span class="collectBtn user_collection" data-id="620091" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 6天前 | <a href="/articletag/1017_new_0_1.html" class="aLightGray" title="websocket">websocket</a> · <a href="/articletag/5401_new_0_1.html" class="aLightGray" title="前端开发">前端开发</a> · <a href="/articletag/27659_new_0_1.html" class="aLightGray" title="sse">sse</a> · <a href="/articletag/40036_new_0_1.html" class="aLightGray" title="实时通知">实时通知</a> · <a href="/articletag/40037_new_0_1.html" class="aLightGray" title="方案选型">方案选型</a> · <a href="javascript:;" class="aLightGray" title="websocket">websocket</a> <a href="javascript:;" class="aLightGray" title="消息推送">消息推送</a> <a href="javascript:;" class="aLightGray" title="EventSource">EventSource</a> <a href="javascript:;" class="aLightGray" title="SSE">SSE</a> <a href="javascript:;" class="aLightGray" title="前端实时通知">前端实时通知</a> <a href="javascript:;" class="aLightGray" title="短轮询">短轮询</a> </div> <div class="tit lineOverflow"><a href="/article/620087.html" title="前端实时通知方案选型：短轮询、SSE、WebSocket 怎么选" class="aBlack">前端实时通知方案选型：短轮询、SSE、WebSocket 怎么选</a></div> <div class="opt"> <span><i class="view"></i>498</span> <span class="collectBtn user_collection" data-id="620087" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 6天前 | <a href="/articletag/243_new_0_1.html" class="aLightGray" title="前端">前端</a> · <a href="/articletag/40002_new_0_1.html" class="aLightGray" title="接口排查">接口排查</a> · <a href="/articletag/40021_new_0_1.html" class="aLightGray" title="运维手册">运维手册</a> · <a href="/articletag/40024_new_0_1.html" class="aLightGray" title="性能告警">性能告警</a> · <a href="javascript:;" class="aLightGray" title="前端">前端</a> <a href="javascript:;" class="aLightGray" title="AbortController">AbortController</a> <a href="javascript:;" class="aLightGray" title="接口超时">接口超时</a> <a href="javascript:;" class="aLightGray" title="Network瀑布图">Network瀑布图</a> <a href="javascript:;" class="aLightGray" title="降级回滚">降级回滚</a> <a href="javascript:;" class="aLightGray" title="线上告警">线上告警</a> </div> <div class="tit lineOverflow"><a href="/article/620079.html" title="前端接口超时告警运行手册：从瀑布图到降级回滚" class="aBlack">前端接口超时告警运行手册：从瀑布图到降级回滚</a></div> <div class="opt"> <span><i class="view"></i>287</span> <span class="collectBtn user_collection" data-id="620079" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 6天前 | <a href="/articletag/243_new_0_1.html" class="aLightGray" title="前端">前端</a> · <a href="/articletag/4729_new_0_1.html" class="aLightGray" title="css">css</a> · <a href="/articletag/9935_new_0_1.html" class="aLightGray" title="sticky">sticky</a> · <a href="/articletag/40022_new_0_1.html" class="aLightGray" title="布局调试">布局调试</a> · <a href="javascript:;" class="aLightGray" title="CSS">CSS</a> <a href="javascript:;" class="aLightGray" title="Overflow">Overflow</a> <a href="javascript:;" class="aLightGray" title="position sticky">position sticky</a> <a href="javascript:;" class="aLightGray" title="滚动容器">滚动容器</a> <a href="javascript:;" class="aLightGray" title="前端调试">前端调试</a> <a href="javascript:;" class="aLightGray" title="吸顶布局">吸顶布局</a> </div> <div class="tit lineOverflow"><a href="/article/620076.html" title="CSS sticky 不生效排查清单：从 top、overflow 到滚动容器逐层定位" class="aBlack">CSS sticky 不生效排查清单：从 top、overflow 到滚动容器逐层定位</a></div> <div class="opt"> <span><i class="view"></i>179</span> <span class="collectBtn user_collection" data-id="620076" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 1星期前 | <a href="/articletag/243_new_0_1.html" class="aLightGray" title="前端">前端</a> · <a href="/articletag/652_new_0_1.html" class="aLightGray" title="静态资源">静态资源</a> · <a href="/articletag/5322_new_0_1.html" class="aLightGray" title="cdn">cdn</a> · <a href="/articletag/40011_new_0_1.html" class="aLightGray" title="云部署">云部署</a> · <a href="javascript:;" class="aLightGray" title="对象存储">对象存储</a> <a href="javascript:;" class="aLightGray" title="静态资源">静态资源</a> <a href="javascript:;" class="aLightGray" title="缓存策略">缓存策略</a> <a href="javascript:;" class="aLightGray" title="cdn">cdn</a> <a href="javascript:;" class="aLightGray" title="前端部署">前端部署</a> <a href="javascript:;" class="aLightGray" title="容器服务">容器服务</a> </div> <div class="tit lineOverflow"><a href="/article/620069.html" title="前端静态资源上云部署选型：对象存储、CDN 和容器服务怎么选" class="aBlack">前端静态资源上云部署选型：对象存储、CDN 和容器服务怎么选</a></div> <div class="opt"> <span><i class="view"></i>433</span> <span class="collectBtn user_collection" data-id="620069" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 1星期前 | <a href="/articletag/243_new_0_1.html" class="aLightGray" title="前端">前端</a> · <a href="/articletag/39982_new_0_1.html" class="aLightGray" title="接口联调">接口联调</a> · <a href="/articletag/39989_new_0_1.html" class="aLightGray" title="表单交互">表单交互</a> · <a href="/articletag/39990_new_0_1.html" class="aLightGray" title="重复提交">重复提交</a> · <a href="/articletag/39991_new_0_1.html" class="aLightGray" title="用户体验">用户体验</a> · <a href="javascript:;" class="aLightGray" title="前端">前端</a> <a href="javascript:;" class="aLightGray" title="表单提交">表单提交</a> <a href="javascript:;" class="aLightGray" title="重复请求">重复请求</a> <a href="javascript:;" class="aLightGray" title="AbortController">AbortController</a> <a href="javascript:;" class="aLightGray" title="幂等键">幂等键</a> <a href="javascript:;" class="aLightGray" title="按钮禁用">按钮禁用</a> </div> <div class="tit lineOverflow"><a href="/article/620045.html" title="前端表单重复提交防护工作流：从按钮状态到请求取消和幂等键" class="aBlack">前端表单重复提交防护工作流：从按钮状态到请求取消和幂等键</a></div> <div class="opt"> <span><i class="view"></i>374</span> <span class="collectBtn user_collection" data-id="620045" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 2星期前 | <a href="/articletag/243_new_0_1.html" class="aLightGray" title="前端">前端</a> · <a href="/articletag/4720_new_0_1.html" class="aLightGray" title="cors">cors</a> · <a href="/articletag/39980_new_0_1.html" class="aLightGray" title="跨域排查">跨域排查</a> · <a href="/articletag/39981_new_0_1.html" class="aLightGray" title="浏览器网络">浏览器网络</a> · <a href="/articletag/39982_new_0_1.html" class="aLightGray" title="接口联调">接口联调</a> · <a href="javascript:;" class="aLightGray" title="前端">前端</a> <a href="javascript:;" class="aLightGray" title="cors">cors</a> <a href="javascript:;" class="aLightGray" title="请求头">请求头</a> <a href="javascript:;" class="aLightGray" title="跨域">跨域</a> <a href="javascript:;" class="aLightGray" title="预检请求">预检请求</a> <a href="javascript:;" class="aLightGray" title="Options">Options</a> </div> <div class="tit lineOverflow"><a href="/article/620039.html" title="前端 CORS 预检失败排查流程：从请求头到网关响应" class="aBlack">前端 CORS 预检失败排查流程：从请求头到网关响应</a></div> <div class="opt"> <span><i class="view"></i>422</span> <span class="collectBtn user_collection" data-id="620039" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> <li> <div class="info"> <a href="/articlelist/19_new_0_1.html" class="aLightGray" title="文章">文章</a> · <a href="/articlelist/88_new_0_1.html" class="aLightGray" title="前端">前端</a> | 2星期前 | <a href="/articletag/243_new_0_1.html" class="aLightGray" title="前端">前端</a> · <a href="/articletag/4729_new_0_1.html" class="aLightGray" title="css">css</a> · <a href="/articletag/9935_new_0_1.html" class="aLightGray" title="sticky">sticky</a> · <a href="/articletag/39972_new_0_1.html" class="aLightGray" title="布局排查">布局排查</a> · <a href="/articletag/39973_new_0_1.html" class="aLightGray" title="滚动容器">滚动容器</a> · <a href="javascript:;" class="aLightGray" title="CSS">CSS</a> <a href="javascript:;" class="aLightGray" title="前端">前端</a> <a href="javascript:;" class="aLightGray" title="Overflow">Overflow</a> <a href="javascript:;" class="aLightGray" title="position sticky">position sticky</a> <a href="javascript:;" class="aLightGray" title="滚动容器">滚动容器</a> <a href="javascript:;" class="aLightGray" title="吸顶失效">吸顶失效</a> </div> <div class="tit lineOverflow"><a href="/article/620035.html" title="前端 position sticky 不生效排查：从滚动容器到 overflow 限制" class="aBlack">前端 position sticky 不生效排查：从滚动容器到 overflow 限制</a></div> <div class="opt"> <span><i class="view"></i>449</span> <span class="collectBtn user_collection" data-id="620035" data-type="article" title="收藏"><i class="collect"></i>收藏</span> </div> </li> </ul> </div> <!-- 课程推荐 --> <div class="contBoxNor"> <div class="contTit"> <div class="tit">课程推荐</div> <a href="/courselist.html" class="more">更多></a> </div> <ul class="classRecomList"> <li> <a href="/course/9.html" title="前端进阶之JavaScript设计模式" class="img_box"> <img src="/uploads/20221222/52fd0f23a454c71029c2c72d206ed815.jpg" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="前端进阶之JavaScript设计模式"> </a> <dl> <dt class="lineOverflow"> 前端进阶之JavaScript设计模式 </dt> <dd class="cont1 lineOverflow">设计模式是开发人员在软件开发过程中面临一般问题时的解决方案，代表了最佳的实践。本课程的主打内容包括JS常见设计模式以及具体应用场景，打造一站式知识长龙服务，适合有JS基础的同学学习。</dd> <dd class="cont2"> <a href="/course/9.html" title="前端进阶之JavaScript设计模式" class="toStudy">立即学习</a> <span>543次学习</span> </dd> </dl> </li> <li> <a href="/course/2.html" title="GO语言核心编程课程" class="img_box"> <img src="/uploads/20221221/634ad7404159bfefc6a54a564d437b5f.png" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="GO语言核心编程课程"> </a> <dl> <dt class="lineOverflow"> GO语言核心编程课程 </dt> <dd class="cont1 lineOverflow">本课程采用真实案例，全面具体可落地，从理论到实践，一步一步将GO核心编程技术、编程思想、底层实现融会贯通，使学习者贴近时代脉搏，做IT互联网时代的弄潮儿。</dd> <dd class="cont2"> <a href="/course/2.html" title="GO语言核心编程课程" class="toStudy">立即学习</a> <span>516次学习</span> </dd> </dl> </li> <li> <a href="/course/74.html" title="简单聊聊mysql8与网络通信" class="img_box"> <img src="/uploads/20240103/bad35fe14edbd214bee16f88343ac57c.png" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="简单聊聊mysql8与网络通信"> </a> <dl> <dt class="lineOverflow"> 简单聊聊mysql8与网络通信 </dt> <dd class="cont1 lineOverflow">如有问题加微信：Le-studyg；在课程中，我们将首先介绍MySQL8的新特性，包括性能优化、安全增强、新数据类型等，帮助学生快速熟悉MySQL8的最新功能。接着，我们将深入解析MySQL的网络通信机制，包括协议、连接管理、数据传输等，让</dd> <dd class="cont2"> <a href="/course/74.html" title="简单聊聊mysql8与网络通信" class="toStudy">立即学习</a> <span>500次学习</span> </dd> </dl> </li> <li> <a href="/course/57.html" title="JavaScript正则表达式基础与实战" class="img_box"> <img src="/uploads/20221226/bbe4083bb3cb0dd135fb02c31c3785fb.jpg" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="JavaScript正则表达式基础与实战"> </a> <dl> <dt class="lineOverflow"> JavaScript正则表达式基础与实战 </dt> <dd class="cont1 lineOverflow">在任何一门编程语言中,正则表达式,都是一项重要的知识,它提供了高效的字符串匹配与捕获机制,可以极大的简化程序设计。</dd> <dd class="cont2"> <a href="/course/57.html" title="JavaScript正则表达式基础与实战" class="toStudy">立即学习</a> <span>487次学习</span> </dd> </dl> </li> <li> <a href="/course/28.html" title="从零制作响应式网站—Grid布局" class="img_box"> <img src="/uploads/20221223/ac110f88206daeab6c0cf38ebf5fe9ed.jpg" onerror="this.onerror='';this.src='/assets/images/moren/morentu.png'" alt="从零制作响应式网站—Grid布局"> </a> <dl> <dt class="lineOverflow"> 从零制作响应式网站—Grid布局 </dt> <dd class="cont1 lineOverflow">本系列教程将展示从零制作一个假想的网络科技公司官网，分为导航，轮播，关于我们，成功案例，服务流程，团队介绍，数据部分，公司动态，底部信息等内容区块。网站整体采用CSSGrid布局，支持响应式，有流畅过渡和展现动画。</dd> <dd class="cont2"> <a href="/course/28.html" title="从零制作响应式网站—Grid布局" class="toStudy">立即学习</a> <span>485次学习</span> </dd> </dl> </li> </ul> </div> </div> <!-- footer --> <div class="footer"> <ul> <li ><a href="/" class="aLightGray"><em class="navIcon navIconHome"></em><span>首页</span></a></li> <li class="curr"><a href="/articlelist.html" class="aLightGray"><em class="navIcon navIconRead"></em><span>阅读</span></a></li> <li ><a href="/courselist.html" class="aLightGray"><em class="navIcon navIconCourse"></em><span>课程</span></a></li> <li ><a href="/ai.html" class="aLightGray"><em class="navIcon navIconAi"></em><span>AI助手</span></a></li> <li ><a href="/user.html" class="aLightGray"><em class="navIcon navIconUser"></em><span>我的</span></a></li> </ul> </div> <script src="/assets/js/frontend/common.js" defer></script> <script src="/assets/js/juejin-theme.js?v=20260613b" defer></script> <script> var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?3dc5666f6478c7bf39cd5c91e597423d"; hm.async = true; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })(); </script> </body> </html>
