JavaScript实现Tab点击切换功能完整示例

<!DOCTYPE html>
<html>
<head>
  <title>www.jb51.net tab点击切换</title>
  <style type="text/css">
  *{
    padding: 0;
    margin: 0;
  }
  #example{
    width: 500px;
    height: 400px;
    margin: 0 auto;
  }
  #example .hd ul li{
    display: inline-block;
    width: 32%;
    height: 36px;
    line-height: 36px;
    border-radius: 5px;
    background-color: #333;
    text-align: center;
    color: #fff;
  }
  #example .hd ul li.current{
    background-color: green;
  }
  #example .bd{
    border: 1px solid #ccc;
    border-radius: 5px;
  }
  #example .bd ul li{
    display: none;
  }
  #example .bd ul li.current{
    display: block;
  }
  </style>
</head>
<body>
  <div id="example">
    <div class="hd">
      <ul>
        <li class="current">Beijing</li>
        <li>Shanghai</li>
        <li>Guangzhou</li>
      </ul>
    </div>
    <div class="bd">
      <ul>
        <li class="current">This is Beijing!</li>
        <li>This is Shanghai</li>
        <li>This is Guangzhou</li>
      </ul>
    </div>
  </div>
  <script type="text/javascript">
  var hd = document.getElementsByClassName("hd")[0].getElementsByTagName("li");
  var bd = document.getElementsByClassName("bd")[0].getElementsByTagName("li");
  for (var i = 0; i < hd.length; i++) {
    hd[i].onclick = function(){
      doTabs(this);
    }
  }
  function doTabs(obj){
    for (var i = 0; i < hd.length; i++) {
      if(hd[i]==obj){
        hd[i].className = "current";
        bd[i].className = "current";
      }else{
        hd[i].className = "";
        bd[i].className = "";
      }
    }
  }
  </script>
</body>
</html>