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 ...

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