jQuery可见性过滤选择器：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>jQuery可见性过滤选择器</title>
<meta name="keywords" content="" />
<meta name="description" content="" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" />
</head>
<body>
<form id="form1">
<div>
第一层</div>
<span style="display: none;">Hidden</span>
<input type="button" id="btn" value="显示" />
</form>
<script src="/demo/js/jq.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$('#btn').click(function () {
//$('span:hidden').addClass('class1').show();
$(':hidden').addClass('class1').show();
//$('div:visible').addClass('class1');
$('div:visible').addClass('class1');
})
})
</script>
</body>
</html>
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