匹配含有子元素或者文本的元素,与:empty(查找所有不包含子元素或者文本的空元素)作用相反
实例:
<!DOCTYPE html>
<html>
<head>
<meta charset=' utf-8'>
<meta name='author' content='http://www.52jb.net/' />
<title>Inset you title</title>
<style type='text/css'>
*{margin:0;padding:0;}
.active{color:#F30;font:900 15px/1.2em "Courier New";}
</style>
<script type='text/javascript' src='./js/jquery-1.12.1.min.js'></script>
<script type='text/javascript'>
$(function(){
$('button').click(function(){
$('div:parent').toggleClass('active');
});
});
</script>
</head>
<body>
<div></div>
<div><span></span></div>
<div>span</div>
<div></div>
<button type='button'>button</button>
</body>
</html>