JS 后台管理菜单

<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
body {
	font-size: 12px;
}
ul, li, h2 {
	margin: 0;
	padding: 0;
}
ul {
	list-style: none;
}
#top {
	width: 900px;
	height: 40px;
	margin: 0 auto;
	background-color: #CCCC00
}
#top h2 {
	width: 150px;
	height: 40px;
	background-color: #99CC00;
	float: left;
	font-size: 14px;
	text-align: center;
	line-height: 40px;
}
#topTags {
	width: 750px;
	height: 40px;
	margin: 0 auto;
	background-color: #CCCC00;
	float: left
}
#topTags ul li {
	float: left;
	width: 100px;
	height: 25px;
	margin-right: 5px;
	display: block;
	text-align: center;
	cursor: pointer;
	padding-top: 15px;
}
#main {
	width: 900px;
	height: 500px;
	margin: 0 auto;
	background-color: #F5F7E6;
}
#leftMenu {
	width: 150px;
	height: 500px;
	background-color: #009900;
	float: left
}
#leftMenu ul {
	margin: 10px;
}
#leftMenu ul li {
	width: 130px;
	height: 30px;
	display: block;
	background: #99CC00;
	cursor: pointer;
	line-height: 30px;
	text-align: center;
	margin-bottom: 5px;
}
#leftMenu ul li a {
	color: #000000;
	text-decoration: none;
}
#content {
	width: 750px;
	height: 500px;
	float: left
}
.content {
	width: 740px;
	height: 490px;
	display: none;
	padding: 5px;
	overflow-y: auto;
	line-height: 30px;
}
#footer {
	width: 900px;
	height: 30px;
	margin: 0 auto;
	background-color: #ccc;
	line-height: 30px;
	text-align: center;
}
.content1 {
	width: 740px;
	height: 490px;
	display: block;
	padding: 5px;
	overflow-y: auto;
	line-height: 30px;
}
</style>
<script type="text/javascript">
window.onload=function(){
	function $(id){return document.getElementById(id)}
	var menu=$("topTags").getElementsByTagName("ul")[0];//顶部菜单容器
	var tags=menu.getElementsByTagName("li");//顶部菜单
	var ck=$("leftMenu").getElementsByTagName("ul")[0].getElementsByTagName("li");//左侧菜单
	var j;
	//点击左侧菜单增加新标签
	for(i=0;i<ck.length;i++){
		ck[i].onclick=function(){
			$("welcome").style.display="none"//欢迎内容隐藏
			clearMenu();
			this.style.background="yellow";
			//循环取得当前索引
			for(j=0;j<8;j++){
				if(this==ck[j]){
					if($("p"+j)==null){
						openNew(j,this.innerHTML);//设置标签显示文字
					}
				clearStyle();
				$("p"+j).style.backgroundColor="yellow";
				clearContent();
				$("c"+j).style.display="block";
				}
			}
			return false;
		}
	}
	//增加或删除标签
	function openNew(id,name){
		var tagMenu=document.createElement("li");
		tagMenu.id="p"+id;
		tagMenu.innerHTML=name+"   "+"<img src='off.gif' style='vertical-align:middle'/>";
		//标签点击事件
		tagMenu.onclick=function(evt){
			clearMenu();
			ck[id].style.background="yellow";
			clearStyle();
			tagMenu.style.backgroundColor="yellow";
			clearContent();
			$("c"+id).style.display="block";
		}
		//标签内关闭图片点击事件
		tagMenu.getElementsByTagName("img")[0].onclick=function(evt){
			evt=(evt)?evt:((window.event)?window.event:null);
			if(evt.stopPropagation){evt.stopPropagation()} //取消opera和Safari冒泡行为;
			this.parentNode.parentNode.removeChild(tagMenu);//删除当前标签
			var color=tagMenu.style.backgroundColor;
			//设置如果关闭一个标签时，让最后一个标签得到焦点
			if(color=="#ffff00"||color=="yellow"){//区别浏览器对颜色解释
				if(tags.length-1>=0){
					clearStyle();
					tags[tags.length-1].style.backgroundColor="yellow";
					clearContent();
					var cc=tags[tags.length-1].id.split("p");
					$("c"+cc[1]).style.display="block";
					clearMenu();
					ck[cc[1]].style.background="yellow";
				}
				else{
					clearContent();
					clearMenu();
					$("welcome").style.display="block";
				}
			}
		}
		menu.appendChild(tagMenu);
	}
	//清除菜单样式
	function clearMenu(){
		for(i=0;i<ck.length;i++){
			ck[i].style.background="#99CC00";
		}
	}
	//清除标签样式
	function clearStyle(){
		for(i=0;i<tags.length;i++){
			menu.getElementsByTagName("li")[i].style.backgroundColor="#FFCC00";
		}
	}
	//清除内容
	function clearContent(){
		for(i=0;i<7;i++){
			$("c"+i).style.display="none";
		}
	}
}
</script>
</head>
<body>
<div id="top">
    <h2>管理菜单</h2>
    <div id="topTags">
        <ul>
        </ul>
    </div>
</div>
<div id="main">
    <div id="leftMenu">
        <ul>
            <li>导航一</li>
            <li>导航二</li>
            <li>导航三</li>
            <li>导航四</li>
            <li>导航五</li>
            <li>导航六</li>
            <li>导航七</li>
        </ul>
    </div>
    <div id="content">
        <div id="welcome" class="content" style="display:block;">
            <div align="center">
                <p> </p>
                <p><strong>欢迎光临</strong></p>
                <p> </p>
            </div>
        </div>
        <div id="c0" class="content"><a href="###">导航一内容</a></div>
        <div id="c1" class="content"><a href="###">导航二内容</a></div>
        <div id="c2" class="content"><a href="###">导航三内容</a></div>
        <div id="c3" class="content"><a href="###">导航四内容</a></div>
        <div id="c4" class="content"><a href="###">导航五内容</a></div>
        <div id="c5" class="content"><a href="###">导航六内容</a></div>
        <div id="c6" class="content"><a href="###">导航七内容</a></div>
    </div>
</div>
<div id="footer">copyright for onestopweb </div>
</body>
</html>
效果图：
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