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页面阻塞 #101

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lovelmh13 opened this issue Jul 5, 2021 · 0 comments

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lovelmh13 commented Jul 5, 2021

快速记要：

css 不会阻塞 DOM 解析，但会阻塞 DOM 渲染（与 DOM 树合成 Layout tree）
js 会阻塞 DOM 解析，所以除非必要，js 都放到了 DOM 之后
浏览器遇到 <script> 且没有 defer 或 async 属性的标签时，会触发页面渲染，因而如果前面 CSS 资源尚未加载完毕时，浏览器会等待它加载完毕在执行脚本。

原来 CSS 与 JS 是这样阻塞 DOM 解析和渲染的

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