<!DOCTYPE html> <html> <head lang="en"> <meta charset="UTF-8"> <title></title> <style> * { margin: 0; padding: 0; } ul { list-style-type: none; } .box { width: 400px; height: 300px; border: 1px solid #ccc; margin: 100px auto; overflow: hidden; } .hd { height: 45px; } .hd span { display: inline-block; width: 90px; background-color: pink; line-height: 45px; text-align: center; cursor: pointer; } .hd span.current { background-color: purple; } .bd li { height: 255px; background-color: purple; display: none; } .bd li.current { display: block; } </style> </head> <body> <div class="box" id="box"> <div class="hd"> <span class="current">体育</span> <span>娱乐</span> <span>新闻</span> <span>综合</span> </div> <div class="bd"> <ul> <li class="current">我是体育模块</li> <li>我是娱乐模块</li> <li>我是新闻模块</li> <li>我是综合模块</li> </ul> </div> </div> <script src="common.js"></script> <script> //获取最外面的div标签 var box = my$("box"); //获取里面的第一个div var hd = box.getElementsByTagName("div")[0]; //获取里面的第二个div var db = box.getElementsByTagName("div")[1]; //获取所有的span标签 var spans = hd.getElementsByTagName("span"); //获取所有的li标签 var lis = db.getElementsByTagName("li"); //循环遍历的方式添加点击事件 for (var i = 0; i < spans.length; i++) { //在点击之前把索引存储到span标签中 spans[i].setAttribute("index", i); spans[i].onclick = function () { //点击的时候获取存储的索引值 var index = this.getAttribute("index"); //第一件事,所有的span的类样式全部移除 for (var j = 0; j < spans.length; j++) { spans[j].removeAttribute("class"); lis[j].removeAttribute("class"); } //第二件事,当前被点击的span添加类样式 this.className = "current"; lis[index].className = "current"; }; } </script> </body> </html>