lovecoding
/
VIP20


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    *{
      margin: 0;
      padding: 0;
    }
    ul{
      list-style: none;
    }
    #btn{
      overflow: hidden;
    }
    #btn li {
      width: 50px;
      height: 30px;
      background: aquamarine;
      text-align: center;
      line-height: 30px;
      border: 1px solid #CCC;
      border-radius: 10px;
      float: left;
    }
    #btn .selected{
      background: orange;
      color: white;
    }
    #div1{
      width: 350px;
      height: 200px;
      border: 1px solid #ccc;
    }
    .actived{
      display: none;
    }
    .choice{
      display: block;
    }
  </style>
</head>
<body>
  <div id="container">
    <ul id="btn">
      <li class="selected">时事</li>
      <li>新闻</li>
      <li>体育</li>
    </ul>
    <div id="div1">
      <div class="actived choice">时事内容</div>
      <div class="actived">新闻内容</div>
      <div class="actived">体育内容</div>
    </div>
  </div>
  <script>
    var btn = document.getElementById('btn')
    var btns = btn.getElementsByTagName('li')
    var content = document.getElementsByClassName('actived')
    console.log(content)
    for(var i=0;i<btns.length;i++){
      btns[i].index = i
      btns[i].onclick = function(){
        //this 点谁就是谁
        for(var j=0;j<btns.length;j++){
          btns[j].className = ''
          content[j].className = 'actived'
        }
        this.className = 'selected' 
        console.log(this.index)
        content[this.index].className = 'actived choice'
      }
    }
    
  </script>
</body>
</html>