美丽的树形菜单,可折叠,有动画

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		<li aid="26">
			<span> <em class="icoopen"></em>
				易语言专题学习
			</span>
			<ul style="display: none;">
				<li aid="27"> <em class="iconleaf"></em>
					网页填表专题
				</li>
				<li aid="28">
					<em class="iconleaf"></em>
					网页封包专题
				</li>
				<li aid="29">
					<em class="iconleaf"></em>
					API一日一练专题
				</li>
			</ul>
		</li>
		<li aid="1">
			<span>
				<em class="icoclose"></em>
				易语言工具箱
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			<ul style="display: block;">
				<li aid="4">
					<em class="iconleaf"></em>
					易语言帮助文档
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				<li aid="2">
					<em class="iconleaf"></em>
					易语言支持库
				</li>
				<li aid="8">
					<span>
						<em class="icoclose2"></em>
						编程辅助
					</span>
					<ul>
						<li aid="10">
							<em class="iconleaf2"></em>
							易语言黑月
						</li>
						<li aid="3">
							<em class="iconleaf2"></em>
							易语言皮肤
						</li>
						<li aid="9">
							<em class="iconleaf2"></em>
							易语言编程工具
						</li>
					</ul>
				</li>
				<li aid="5">
					<span>
						<em class="icoclose2"></em>
						易语言模块
					</span>
					<ul>
						<li aid="7">
							<em class="iconleaf2"></em>
							易语言模块源代码
						</li>
						<li aid="6">
							<em class="iconleaf2"></em>
							易语言成品模块
						</li>
					</ul>
				</li>
			</ul>
		</li>
		<li aid="11">
			<span>
				<em class="icoclose"></em>
				易语言源代码
			</span>
			<ul>
				<li aid="17">
					<span>
						<em class="icoclose2"></em>
						易语言行业源代码
					</span>
					<ul>
						<li aid="25">
							<em class="iconleaf2"></em>
							网络相关
						</li>
						<li aid="23">
							<em class="iconleaf2"></em>
							模块控件
						</li>
						<li aid="22">
							<em class="iconleaf2"></em>
							数据库类
						</li>
						<li aid="21">
							<em class="iconleaf2"></em>
							游戏娱乐
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						<li aid="20">
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							多媒体类
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						<li aid="19">
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							图形图像
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						<li aid="18">
							<em class="iconleaf2"></em>
							系统工具
						</li>
						<li aid="24">
							<em class="iconleaf2"></em>
							行业软件
						</li>
					</ul>
				</li>
				<li aid="12">
					<span>
						<em class="icoclose2"></em>
						易语言学习例程
					</span>
					<ul>
						<li aid="15">
							<em class="iconleaf2"></em>
							进阶例程
						</li>
						<li aid="16">
							<em class="iconleaf2"></em>
							高级例程
						</li>
						<li aid="14">
							<em class="iconleaf2"></em>
							0基础例程
						</li>
						<li aid="13">
							<em class="iconleaf2"></em>
							入门例程
						</li>
					</ul>
				</li>
			</ul>
		</li>
	</ul>
</div>



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.lmenu li{list-style: none;}
.lmenu em {display: block;position: absolute;cursor: pointer;}
.icoopen{left: 28px;background-position: 0 -39px;}
.icoopen2{left: 42px;background-position: -46px -88px;}
.icoclose{left: 28px;background-position: -45px -39px;}
.icoclose2{left: 42px;background-position: 0 -88px;}

.iconleaf , .iconleaf2{ 3px;height: 5px;background-position: -87px -41px;}

.iconleaf {left: 47px;top: 11px;}
.iconleaf2 {left: 72px;top: 10px;}

.search-side{
	 250px;
	border-radius: 5px;
	position: relative;
	background-color: #FFFFFF;
	border: 1px solid #ddd;
	height: 36px;
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}
.search-side button{
	background-position: 0 0;
	border: 0 none;
	cursor: pointer;
	display: block;
	height: 16px;
	 16px;
	position: relative;
	left: 11px;
}
.search-box input{
	position: absolute;
	top: 11px;
	background-color: transparent;
	border: medium none;
	color: #AFB0B0;
	height: 16px;
	margin-left: 37px;
	outline: medium none;
	 200px;
}


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	 250px;
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.lmenu ul li{
	position: relative;
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.lmenu ul li ul{
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.lmenu ul li ul li ul{
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.lmenu ul li span{
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	 100%;
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	background-position: -46px 0;
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.lmenu ul li ul li , .lmenu ul li ul li span{
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.lmenu ul li ul li span{
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.lmenu ul li ul li ul li{
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	font-size: 12px;
	font-weight: normal;
	height: 24px;
	line-height: 24px;
}
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<script type="text/javascript" src="jquery-1.9.1.js"></script>
<script>
$(function() {
			loadMenu(function (id){
				window.location= '/index.php/index/baoku' + '/id/' + id + '.html';
			});
			$('li[aid=]').css('background',"#F5F5F5");


		});


	/*传入一个函数參数为 id 即li上的属性 aid*/
	function loadMenu (fun_clickAction) {
		/*事件回调函数*/
		clickAction = fun_clickAction;
		/*一级菜单的样式*/
		$(".lmenu > ul > li > span").prepend('<em class="icoclose"></em>');
		/*二级菜单的样式*/
		$(".lmenu > ul > li > ul > li").each(function(){
			/*检查是否有节点*/
			span = $(this).find("span"); 
			if ( span.length ){
				//有节点的话
				span.prepend('<em class="icoclose2"></em>');
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				//无节点的话,绑定事件
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					   .click(function(){
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		/*三级菜单的样式*/
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		$(".lmenu ul li span").click(function(){
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			if( classNama == 'icoclose'){ye.attr('class','icoopen');}
			else if( classNama == 'icoopen' ){ye.attr('class','icoclose');}
			else if( classNama == 'icoclose2'){ye.attr('class','icoopen2');}
			else if( classNama == 'icoopen2' ){ye.attr('class','icoclose2');}
			$(this).siblings("ul").slideToggle("normal","swing");
		});
	}

</script>


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原文地址:https://www.cnblogs.com/slgkaifa/p/6835285.html