lovecoding
/
VIP22


			
				
					
						
						
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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;
    }
    #btns{
      overflow: hidden;
    }
    #btns li{
      width: 50px;
      height: 30px;
      background: aqua;
      border: 1px solid #ccc;
      text-align: center;
      line-height: 30px;
      border-radius: 10px;
      float: left;
    }
    #div1{
      border: 1px solid #ccc;
      width: 350px;
      height: 200px;
    }
    .actived{
      display: none;
    }
    .choice{
      display: block;
    }
    #btns .selected{
      background: orange;
      color: white;
    }
  </style>
</head>
<body>
  <div id="container">
    <ul id="btns">
      <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.getElementsByTagName('li')
    var content = document.getElementsByClassName('actived')
    for(var i=0;i<btn.length;i++){ // 循环数组每一项  去找到每一个按钮
      //给按钮设置一个属性 让这个属性值等于索引
      //创建了一个属性
      btn[i].index = i
      //btn[1].index = 1
      //每一个按钮都添加一个点击事件
      btn[i].onclick = function(){
        //循环
        for(var j=0;j<content.length;j++){
          //点击的时候 一上来把所有的样式都清空  然后再给点击的加样式
          btn[j].className = ''
          content[j].className = 'actived'
        }
        //给点击的按钮加样式
        //this = btn[i]
        //新闻 = btn[1]
        this.className = 'selected'
        //content[1].className ='actived choice'
        //this = btn[i]
        //btn[1].index = 1 
        //content[0] [1] [2]
        content[this.index].className = 'actived choice'
      }
    }
  </script>
</body>
</html>