JavaScript实现多级下拉菜单完整代码示例

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
 
  <head>
    <title>下拉菜单</title>
    <meta http-equiv="content-Type" content="text/html;charset=utf-8">
    <style type="text/css">
      .navi ul {
        padding: 0;
        list-style-type: none;
      }
      .navi ul li {
        text-align: center;
        float: left;
        position: relative;
        width: 200px;
        background-color: #0F8CFF;
      }
      a {
        color: #086808;
        text-decoration: none;
      }
      .navi ul li a {
        display: block;
        border: 1px solid #fff;
      }
      .navi ul li ul {
        display: none;
        left: 0;
      }
      .navi ul li ul li ul{
        position: absolute;
        left:200px;
        top: 0;
      }
      .navi ul li:hover ul a {
        color: yellow;
      }
    </style>
 
    <script type="text/javascript">
      function showNextMenu(obj){
        var nextMenu = obj.getElementsByTagName("ul")[0];
        nextMenu.style.display = "block";
      }
      function hideNextMenu(obj){
        var nextMenu = obj.getElementsByTagName("ul")[0];
        nextMenu.style.display = "none";
      }
    </script>
  </head>
 
  <body>
 
    <div class="navi">
      <ul >
        <li class="li_1" onmousemove="showNextMenu(this);" onmouseout="hideNextMenu(this);">
          <a href="javascript:;" >游戏</a>
          <ul>
            <li onmousemove="showNextMenu(this);" onmouseout="hideNextMenu(this);">
              <a href="javascript:;" >传奇</a>
 
              <ul>
                <li>
                  <a href="javascript:;" >1</a>
                </li>
                <li>
                  <a href="javascript:;" >2</a>
                </li>
                <li>
                  <a href="javascript:;" >3</a>
                </li>
              </ul>
            </li>
            <li>
              <a href="javascript:;" >传奇</a>
            </li>
            <li>
              <a href="javascript:;" >传奇</a>
            </li>
            <li>
              <a href="javascript:;" >传奇</a>
            </li>
            <li>
              <a href="javascript:;" >传奇</a>
            </li>
          </ul>
        </li>
        <li class="li_1">
          <a href="javascript:;" >游戏</a>
          <ul>
            <li>
              <a href="javascript:;" >传奇</a>
            </li>
          </ul>
        </li>
        <li class="li_1">
          <a href="javascript:;" >游戏</a>
          <ul>
            <li>
              <a href="javascript:;" >传奇</a>
            </li>
          </ul>
        </li>
        <li class="li_1">
          <a href="javascript:;" >游戏</a>
          <ul>
            <li>
              <a href="javascript:;" >传奇</a>
            </li>
          </ul>
        </li>
      </ul>
    </div>
 
  </body>
 
</html>