JavaScript实现Tab页切换功能的完整示例

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>www.jb51.net JS实现的TAB切换</title>
    <style type="text/css">
      #content {
        width: 400px;
        height: 200px;
      }
      #tab_bar {
        width: 400px;
        height: 20px;
        float: left;
      }
      #tab_bar ul {
        padding: 0px;
        margin: 0px;
        height: 20px;
        text-align: center;
      }
      #tab_bar li {
        list-style-type: none;
        float: left;
        width: 133.3px;
        height: 20px;
        background-color: gray;
      }
      .tab_css {
        width: 400px;
        height: 200px;
        background-color: orange;
        display: none;
        float: left;
      }
    </style>
    <script type="text/javascript">
      var myclick = function(v) {
        var llis = document.getElementsByTagName("li");
        for(var i = 0; i < llis.length; i++) {
          var lli = llis[i];
          if(lli == document.getElementById("tab" + v)) {
            lli.style.backgroundColor = "orange";
          } else {
            lli.style.backgroundColor = "gray";
          }
        }
        var divs = document.getElementsByClassName("tab_css");
        for(var i = 0; i < divs.length; i++) {
          var divv = divs[i];
          if(divv == document.getElementById("tab" + v + "_content")) {
            divv.style.display = "block";
          } else {
            divv.style.display = "none";
          }
        }
      }
    </script>
  </head>
  <body>
    <div id="content">
      <div id="tab_bar">
        <ul>
          <li id="tab1" onclick="myclick(1)" style="background-color: orange">
            tab1
          </li>
          <li id="tab2" onclick="myclick(2)">
            tab2
          </li>
          <li id="tab3" onclick="myclick(3)">
            tab3
          </li>
        </ul>
      </div>
      <div class="tab_css" id="tab1_content" style="display: block">
        <div>页面一</div>
      </div>
      <div class="tab_css" id="tab2_content">
        <div>页面二</div>
      </div>
      <div class="tab_css" id="tab3_content">
        <div>页面三</div>
      </div>
    </div>
  </body>
</html>