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为什么 Vue.js 中动态变更标签样式无效？

时间：2024-11-22 18:15:53 486浏览 收藏

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为什么 Vue.js 中动态变更标签样式无效？

动态变更标签样式的疑惑

在使用 vue.js 时，遇到一个问题：为一个标签添加了动态样式，基于某个事件触发后传入一个布尔值，理论上样式会发生改变。然而，触发事件后，样式却没有发生变化。

问题代码如下：

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<pre><code>
<div class="content" :class="{ active:iscollapse }">
    <myheader @changemenu="changemenu" :iscollapse="!iscollapse"></myheader>
</code></pre>
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<pre><code>
data () {
    return {
        iscollapse: false
    }
},
methods: {
    changemenu () {
        this.iscollapse = !this.iscollapse
    }
}
</code></pre>
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<pre><code>
.content {
   padding-left: 200px;
   .active {
       padding-left: 65px;
   }
}
</code></pre>

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<style>
#app .content {
    padding-left: 200px;
}</pre><p>问题源自后代选择器的写法，应该将样式写成同级，即：</p><pre class="brush:php;toolbar:false"><pre><code>
.content {
    padding-left: 200px;
}
.active {
    padding-left: 65px;
}
</code></pre></pre><p>在使用后代选择器时（".content .active"），样式只会在 ".active" 是 ".content" 后代元素时生效。而在同级选择器（".content.active"）中，".active" 与 ".content" 将出现在同一个元素上，才能让样式生效。</p><p>今天关于《为什么 Vue.js 中动态变更标签样式无效？》的内容介绍就到此结束，如果有什么疑问或者建议，可以在golang学习网公众号下多多回复交流；文中若有不正之处，也希望回复留言以告知！</p>      </div>
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