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<!DOCTYPE html>
<html lang="en">
<head>
<meta name="description" content="tab demo 面向对象">
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    .on{
      background-color: red;
    }
    #tab div{
      width: 400px;
      height: 400px;
      display: none;
      border: 1px solid #ccc;
    }
    #tab .block{
      display: block;
    }
  </style>
  <script>
    window.onload=function(){
      function Tab(name){
        this.oPrent = document.getElementById(name);
        this.oMenu = this.oPrent.getElementsByTagName('input');
        this.oShow = this.oPrent.getElementsByTagName('div');
      }
      Tab.prototype.init = function(){
        var This = this;
        for(i=0;i<this.oMenu.length;i++){
          this.oMenu[i].index = i;
          this.oMenu[i].onclick=function(){
            This.change(this);
          }
        }
      }
      Tab.prototype.change = function(obj){
        for(j=0;j<this.oMenu.length;j++){
          this.oMenu[j].className = '';
          this.oShow[j].className = '';
        }
        obj.className = 'on';
        this.oShow[obj.index].className = 'block';
      }
      Tab.prototype.auto = function(){
        var nowShow = 0;
        var This = this;
        var timmer = setInterval(function(){
          if(nowShow>=This.oMenu.length){
            nowShow = 0;
          }
          This.oMenu[nowShow].index = i;
            for(j=0;j<This.oMenu.length;j++){
              This.oMenu[j].className = '';
              This.oShow[j].className = '';
            }
            This.oMenu[nowShow].className = 'on';
            This.oShow[nowShow].className = 'block';
          nowShow++;
        },1000)
      }
      var tab = new Tab('tab');
      tab.init();
      tab.auto();
    }
  </script>
</head>
<body>
  <div id="tab">
    <input type="button" class="on" value="1">
    <input type="button" value="2">
    <input type="button" value="3">
    <div class="block">111111111</div>
    <div>222222222</div>
    <div>333333333</div>
  </div>
</body>
</html>
​
 
​
 
​
Output 300px

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