lovecoding
/
VIP28


			
				
					
						
						
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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;
    }

    li {
      width: 50px;
      height: 30px;
      border: 1px solid #ccc;
      text-align: center;
      line-height: 30px;
      border-radius: 10px;
      background: aqua;
      float: left;
    }

    #div1 {
      width: 400px;
      height: 200px;
      border: 1px solid #ccc;
    }

    .selected {
      color: white;
      background: orange;
    }

    .active {
      display: none;
    }

    .select {
      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="active select">时事内容</div>
      <div class="active">新闻内容</div>
      <div class="active">体育内容</div>
    </div>
  </div>
  <script>
    var btns = document.getElementsByTagName('li')
    var content = document.getElementsByClassName('active')

    for (var i = 0; i < btns.length; i++) {
      btns[i].index = i
      //时事.index = 0
      //新闻.index = 1
      //体育.index = 2
      console.log(btns[i].index)
      btns[i].onclick = function () {
        for (var j = 0; j < btns.length; j++) {
          btns[j].className = ' '
          content[j].className = 'active'
        }

        // console.log(this.index) 

        //谁的点击事件就是谁  btn[i].onclick    btns[]
        this.className = 'selected'
        //content[索引值] = content[btns点击谁的索引值] =content[this.index]
        content[this.index].className = 'active select'

        //想点击新闻  新闻.index = 1
        //this.className = 新闻.className = 'selected'
        //content[新闻.index].className = 'active select'
        //content[1].className = 'active select'  新闻内容

      }
    }
  </script>
</body>

</html>