树形菜单代码演示| 金飞科技[3A88.COM]

　　一个类似于QQ的树形菜单，可以折叠和展开，非常方便，并且效果很好，自己应用时可以把代码分离出来直接使用。下面我把代码贴出来。您可以用运行代码功能直接看到运行效果。

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> 树形菜单代码 </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</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;

    //if (window.opera) return; // I'm too tired

    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(/images/plus.gif) 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(/images/square.gif) 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 {
  /*border-bottom: 1px dashed #000;*/
  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">树形菜单防QQ</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="#">张三[10000001]</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>
                <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>

　　　提示：点击运行代码按钮可看到实际效果

更新时间：2010-4-20