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test.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>背景切换</title>
<!-- Bootstrap -->
<link href="http://cdn.bootcss.com/bootstrap/3.3.2/css/bootstrap.min.css" rel="stylesheet">
<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="http://cdn.bootcss.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="http://cdn.bootcss.com/respond.js/1.4.2/respond.min.js"></script>
<![endif]-->
<link rel="stylesheet" type="text/css" href="http://cdn.bootcss.com/font-awesome/4.3.0/css/font-awesome.min.css">
<!--[if IE 7]>
<link rel="stylesheet" href="http://cdn.bootcss.com/font-awesome/3.2.1/css/font-awesome-ie7.min.css">
<![endif]-->
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="http://cdn.bootcss.com/jquery/2.1.3/jquery.min.js"></script>
<style type="text/css">
.a1 { background-color: #ccc; }
.a2 { background-color: #ccc; }
.a3 { background-color: #ccc; }
.a4 { background-color: #ccc; }
.on-a1 { background-color: #ddd; }
.on-a2 { background-color: #ddd; }
.on-a3 { background-color: #ddd; }
.on-a4 { background-color: #ddd; }
</style>
</head>
<body>
<div class="container">
<h1>改变背景</h1>
<ul class="list-group col-md-3">
<li><a class="list-group-item a1" href="javascript:">111</a></li>
<li><a class="list-group-item a2" href="javascript:">222</a></li>
<li><a class="list-group-item a3" href="javascript:">333</a></li>
<li><a class="list-group-item a4" href="javascript:">444</a></li>
</ul>
</div>
<script type="text/javascript">
$('.list-group-item').click(function(){
init();
var index = $('.list-group-item').index($(this))+1;
$(this).removeClass('a'+index).addClass('on-a'+index);
});
function init(){
$('.list-group-item').each(function(i, v){
var index = ++i;
$(this).removeClass('on-a'+index).addClass('a'+index);
});
}
$(function(){
var a = $('a:contains("444")');
console.log(a);
});
</script>
<!-- Scripts -->
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="http://cdn.bootcss.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
</body>
</html>