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文章 · 前端 | 1天前 |

PerformanceAPI可精准采集FP、FCP、LCP、FID、TTFB等核心性能指标，通过performance.timing、getEntries()及PerformanceObserver获取页面加载与交互数据，结合mark打点和measure测量自定义逻辑耗时，利用sendBeacon上报关键数据，实现轻量高效的前端性能监控。

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文章 · 前端 | 5天前 |

动态数字滚动效果实现方法

纯CSS无法实现数字动态滚动，必须用JavaScript配合requestAnimationFrame控制数值演进，结合IntersectionObserver触发及正则提取纯数字，确保平滑、精准、低开销。

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文章 · 前端 | 3天前 | html html函数

构建评论区的表单时，通常使用 HTML 的

标签来包裹表单元素，其中多行文本域（

）用于用户输入较长的评论内容。以下是基本结构和属性设置说明：✅ 基本表单结构示例<form action="/submit-comment" method="post">
  <label for="name">姓名：</label>
  <input type="text" id="</a></div>
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                                <div class="cont lineFourOverflow">答案：使用form标签构建评论区，通过textarea实现多行文本输入，设置name、rows、cols、placeholder、maxlength等属性优化交互，并结合CSS提升用户体验。</div>
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                                <div class="cont lineFourOverflow">Unicode属性转义\p{...}是ES2018引入的正则特性，支持按脚本（如Han、Greek）和类别语义化匹配字符，需/u标志且运行于现代浏览器或Node.js10+环境。</div>
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                                <div class="cont lineFourOverflow">JavaScript迭代器是支持for...of等语法的协议机制，核心为返回{value,done}对象的next()方法；需同时满足可迭代协议（含[Symbol.iterator]方法）和迭代器协议（next方法返回指定结构对象）。</div>
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                                <div class="cont lineFourOverflow">JavaScript可直接调用浏览器WebAPI；本地存储有localStorage（持久化）、sessionStorage（会话级）和IndexedDB（结构化数据库）三种方式，各适用于不同场景。</div>
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                <div class="tit lineTwoOverflow"><a href="/article/602490.html" class="aBlack">HTML中matches方法使用详解</a></div>
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                                <div class="cont lineFourOverflow">Element.matches()用于检查元素是否匹配CSS选择器，返回布尔值；IE8-不支持，需用querySelectorAll模拟，注意选择器合法性及转义。</div>
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                                <div class="cont lineFourOverflow">原生<ul>嵌套是最稳的方案，不依赖JS、不靠第三方库、打开即见结构；必须用<li>包裹内容、子<ul>嵌在<li>内，用margin-left和伪元素控制缩进与连线，确保跨浏览器及PDF导出稳定。</div>
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                                <div class="cont lineFourOverflow">CSSGrid用auto-fit与minmax()实现响应式图片网格，避免flex-wrap断行错位；用figure包裹图文并设display:inline-block保证布局；图片错误监听onerror降级，dialog实现轻量预览，状态同步优先class切换。</div>
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                <div class="tit lineTwoOverflow"><a href="/article/598788.html" class="aBlack">Element.insertAdjacentHTML比innerHTML更高效的原因在于它不会破坏现有的DOM元素，从而避免了重新解析和重建整个DOM结构的开销。以下是如何使用 element.insertAdjacentHTML 比 innerHTML 更高效地插入HTML的详细说明：1. 基本用法element.insertAdjacentHTML(position, htmlString);</a></div>
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                                <div class="cont lineFourOverflow">insertAdjacentHTML比innerHTML快，因其跳过序列化现有DOM的步骤，直接解析插入HTML字符串，不重建原有子节点；实测插入100条列表项时快2–4倍。</div>
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                                <div class="cont lineFourOverflow">绝对定位元素使父容器高度为0，因其彻底脱离文档流，父容器计算高度时完全“看不见”它们；这是CSS规范行为，非bug。常见现象包括offsetHeight为0、背景不显示、兄弟元素上移；clearfix等浮动清除方案无效。</div>
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                <div class="tit lineTwoOverflow"><a href="/article/597025.html" class="aBlack">Vue计算属性生成验证码实现教程</a></div>
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                                <div class="cont lineFourOverflow">验证码生成不应使用计算属性，而应由methods或setup中的函数完成，用ref存储真实值、computed仅作只读转换；必须确保生成可控、与后端同步、防调试暴露、输入即时校验并禁用空码提交。</div>
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