JS模拟的QQ面板上的多级可展开的菜单_菜单导航特效

JavaScript结合 CSS完成QQ聊天面板菜单的功能，点击某一项菜单后，开始展开，再次点击则关闭，支持多级（三级），代码中预留有用于修饰的背景图像代码，请根据你的实际需要补全，应该是非常实用的。

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE>QQ菜单</TITLE>
</HEAD>
<BODY>
<script>
if (!document.getElementById)
    document.getElementById = function() { return null; }
function initializeMenu(menuId, actuatorId) {
    var menu = document.getElementById(menuId);
    var actuator = document.getElementById(actuatorId);
    if (menu == null || actuator == null) return;
    actuator.parentNode.style.backgroundImage = "url(/images/plus.gif)";
    actuator.onclick = function() {
        var display = menu.style.display;
        this.parentNode.style.backgroundImage =
            (display == "block") ? "url(/images/plus.gif)" : "url(/images/minus.gif)";
        menu.style.display = (display == "block") ? "none" : "block";
        return false;
    }
}
 window.onload = function() {
            initializeMenu("productsMenu", "productsActuator");
            initializeMenu("newPhonesMenu", "newPhonesActuator");
            initializeMenu("compareMenu", "compareActuator");
        }
</script>
<style>
body {
  font-family: verdana, helvetica, arial, sans-serif;
}
#mainMenu {
  background-color: #EEE;
  border: 1px solid #CCC;
  color: #000;
  width: 203px;
}
#menuList {
  margin: 0px;
  padding: 10px 0px 10px 15px;
}
li.menubar {
  background: url() no-repeat 0em 0.3em;
  font-size: 12px;
  line-height: 1.5em;
  list-style: none outside;
}
.menu, .submenu {
  display: none;
  margin-left: 15px;
  padding: 0px;
}
.menu li, .submenu li {
  background: url() no-repeat 0em 0.3em;
  list-style: none outside;
}
a.actuator {
  background-color: transparent;
  color: #000;
  font-size: 12px;
  padding-left: 15px;
  text-decoration: none;
}
a.actuator:hover {
  text-decoration: underline;
}
.menu li a, .submenu li a {
  background-color: transparent;
  color: #000;
  font-size: 12px;
  padding-left: 15px;
  text-decoration: none;
}
.menu li a:hover, submenu li a:hover {
  text-decoration: underline;
}
span.key {
  text-decoration: underline;
}
</style>
</head>
<body>
<div id="mainMenu">
      <ul id="menuList">
        <li class="menubar">
          <a href="#" id="productsActuator" class="actuator">我有朋友圈</a>
          <ul id="productsMenu" class="menu">
            <li>
              <a href="#" id="newPhonesActuator" class="actuator">我的好友</a>
              <ul id="newPhonesMenu" class="submenu">
                <li><a href="#">张三[10000001]</a></li>
                <li><a href="#">李四[10000002]</a></li>
                <li><a href="#">李四[10000002]</a></li>
              </ul>
            </li>
            <li>
              <a href="#" id="compareActuator" class="actuator">陌生人</a>
              <ul id="compareMenu" class="submenu">
                <li><a href="#">张三[10000001]</a></li>
                <li><a href="#">李四[10000002]</a></li>
              </ul>
            </li>
          </ul>
        </li>
      </ul>
    </div>
  </body>
</BODY>
</HTML>

所属频道：菜单导航特效/更新时间：2012-11-13

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