文章浏览阅读3次。本文围绕 zh.javascript.info 教程《浏览器事件简介》章节中的第 5 道练习「创建滑动菜单」展开，完整解析一个纯 HTML/CSS/JavaScript 实现的点击开合菜单：从 HTML 结构设计（为何标题要用 `` 而不是 ``）、CSS 用 `.open` 类驱动状态切换与 `::before` 伪元素箭头，到 JS 侧 `onclick` + `clas ...

covering all the hot paths through the loop. the VM would start tracing there. When the inner loop exits, the VM would detect that a different branch was taken. The VM would try to record a branch ...

什么是正则表达式 正则表达式是由一个*模式（pattern） 和若干可选的 标志（flags）*组成的文本匹配描述。在 JavaScript 中，它通过内置的 RegExp 对象提供，同时深度集成在字符串的各种方法中（ str.match 、 str.replace 、 str.search 、 str.split 等）。

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