1、首先获取id元素。
2、for循环历遍按钮元素添加onclick事件。
3、排他思想，点击按钮时设置所有选项卡按钮样式为空，利用this关键字指定当前选项卡获得高亮样式。
4、下面的多个div内容块以此类推。
源代码：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>简单的选项卡切换（仿Hao123导航）</title> </head> <style> * { margin: 0; padding: 0; } .box { width: 278px; margin: 0 auto; margin-top: 100px; background-color: #F7F7F8; overflow: hidden; } .btn button { outline:none; color: #616161; font:14px/100% arial,"Hiragino Sans GB","Hiragino Sans GB W3",\5b8b\4f53; border: none; height: 34px; width: 51px; background-color: #F7F7F8; float: left; cursor: pointer; } .box .btn i { height: 16px; border-left: 1px solid #EAEAEA; margin-top: 9px; float: left; _font-size: 0px; } .box .btn button:hover { color: #0AA770; } .box .btn s { cursor: pointer; text-decoration: none; font:14px/34px arial,"Hiragino Sans GB","Hiragino Sans GB W3",\5b8b\4f53; } #box1 #btns .clickbtn { border-top: 1px solid #0AA770; color: #0AA770; } .bottom { display: none; position: absolute; width: 278px; height: 110px; color: #fff; text-align: center; font:14px/100% arial,"Hiragino Sans GB","Hiragino Sans GB W3",\5b8b\4f53; } .bottom a { color: #fff; position: relative; top: -20px; left: 0px; text-decoration: none; } .bottom a:hover { text-decoration: underline; } </style> <script> window.onload = function(){ var btns = document.getElementById("btns").getElementsByTagName("button"); var divs = document.getElementById("bottomdivs").getElementsByTagName("div"); btns[0].className = "clickbtn"; for(var i = 0;i<btns.length;i++){ btns[i].index = i; btns[i].onclick = function(){ //alert(this.index); for(var j = 0;j<btns.length;j++){ btns[j].className = ""; } this.className = "clickbtn"; for(var b = 0;b<btns.length;b++){ divs[b].style.display = "none"; } divs[this.index].style.display = "block"; } } } </script> <body> <div> <div> <button>推介</button> <i></i> <button>社会</button> <i></i> <button>娱乐</button> <i></i> <button>军事</button> <i></i> <button>体育</button> <s>+</s> </div> <div> <div> <img src="https://www.jb51.net/images/01.jpg" alt=""> <h4><a href="#" >小伙直播时遭遇“闹鬼”事件 全过程被拍下</a></h4> </div> <div> <img src="https://www.jb51.net/images/02.jpg" alt=""> <h4><a href="#" >男子穿新郎装背充气娃娃游街</a></h4> </div> <div> <img src="https://www.jb51.net/images/03.jpg" alt=""> <h4><a href="#" >她满足所有人对才女的幻想</a></h4> </div> <div> <img src="https://www.jb51.net/images/04.jpg" alt=""> <h4><a href="#" >王毅回应中美是否会在南海发生冲突</a></h4> </div> <div> <img src="https://www.jb51.net/images/05.jpg" alt=""> <h4><a href="#" >刘翔与娇妻秀恩爱 豪车曝光车牌太抢眼</a></h4> </div> </div> </div> </body> </html>