简单实现js选项卡切换效果

本文实例为大家分享了js选项卡切换效果的具体代码，供大家参考，具体内容如下

实现思路：

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 class="box" id="box1">
 <div class="btn" id="btns">
  <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 id="bottomdivs">
  <div class="bottom" style="display: block">
   <img src="images/01.jpg" alt="">
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 </div>
</div>
</body>
</html>

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