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    Css
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 * {
	margin:0;
	padding:0;
}
.nav {
	list-style:none;
	width:300px;
	margin:100px auto;
	/*border:1px solid #000;
	*/
}
.nav>li {
	border:1px solid #000;
	line-height:35px;
	border-bottom:none;
	text-indent:2em;
	position:relative;
}
.nav>li:last-child {
	border-bottom:1px solid #000;
	border-bottom-right-radius:10px;
	border-bottom-left-radius:10px;
}
.nav>li:first-child {
	border-top-right-radius:10px;
	border-top-left-radius:10px;
}
.nav>li>span {
	background:url("images/arrow_right.png") no-repeat center center;
	display:inline-block;
	width:32px;
	height:32px;
	position:absolute;
	right:10px;
	top:5px;
}
.sub {
	display:none;
}
.sub>li {
	list-style:none;
	background:mediumpurple;
	border-bottom:1px solid white;
}
.sub>li:hover {
	background:red;
}
.nav>.current>span {
	transform:rotate(90deg);
}

 
↑上面代碼改變,會自動顯示代碼結果 jQuery調用版本:1.11.3
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