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$(function(){
$("li").toggle(
function(){
$(this).removeClass("one");
$(this).addClass("two");
},
function(){
$(this).removeClass("two");
$(this).addClass("one");
}
)
})
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, minimum-scale=1.0, maximum-scale=1.0">
<link href="css/mobile.css" rel="stylesheet" />
<title>test</title>
<script type="text/javascript" src="js/app.js"></script>
</head>
<style type="text/css">
.test li{margin-bottom:10px}
.one{background:#f00;}
.two{background:#000;color:#fff;font-weight:bold;}
</style>
<body>
<div class="test">
<ul>
<li class="one">AAAAAAAAAAA</li>
<li class="one">AAAAAAAAAAA</li>
<li class="one">AAAAAAAAAAA</li>
<li class="one">AAAAAAAAAAA</li>
</ul>
</div>
<script type="text/javascript">
$(function(){
$(".test").bind("click",function(e){
e = e || window.event;
var tar = e.srcElement || e.target;
if(tar.nodeName.toLowerCase() == "li" && !$(tar).hasClass('two')){
$(tar).addClass("two");
$(tar).siblings().removeClass("two");
}else{
$(tar).removeClass("two");
}
})
})
</script>
</body>
</html>