网站制作：CSS效果的隐藏/显示型菜单

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CSS效果的隐藏/显示型菜单

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<head>
<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">Phones</a>
          <ul id="productsMenu" class="menu">
            <li>
              <a href="#" id="newPhonesActuator" class="actuator">New Phones</a>
              <ul id="newPhonesMenu" class="submenu">
                <li><a href="#">9290</a></li>
                <li><a href="#">8390</a></li>
                <li><a href="#">8290</a></li>
                <li><a href="#">8270</a></li>
              </ul>
            </li>
            <li>
              <a href="#" id="compareActuator" class="actuator">Compare</a>
              <ul id="compareMenu" class="submenu">
                <li><a href="#">All Phones</a></li>
                <li><a href="#">Service Provider</a></li>
              </ul>
            </li>
          </ul>
        </li>
      </ul>
    </div>
</body>

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