[ jquery 过滤器 filter(expr|obj|ele|fn) ] 筛选出与指定表达式匹配的元素集合,这个方法用于缩小匹配的范围,用逗号分隔多个表达式
筛选出与指定表达式匹配的元素集合,这个方法用于缩小匹配的范围,用逗号分隔多个表达式
当参数是函数时,函数里面的参数解释如下:
一个函数用来作为测试元素的集合。它接受一个参数index，这是元素在jQuery集合的索引。在函数， this指的是当前的DOM元素
实例:<!DOCTYPE html>
<html lang='zh-cn'>
<head>
<title>Insert you title</title>
<meta http-equiv='description' content='this is my page'>
<meta http-equiv='keywords' content='keyword1,keyword2,keyword3'>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script type='text/javascript' src='./js/jquery-1.12.1.min.js'></script>
<style type="text/css">
*{margin:0;padding:0;}
html{font:400 15px/1.2em 'Courier New';color:#666;width:750px;margin:25px auto;}
div > p{white-space: pre-wrap;margin:15px 0;}
div >*{text-indent:8px;}
.hover{color:#FF96EC;}
</style>
<script type='text/javascript'>
$(function(){
/*
筛选出与指定表达式匹配的元素集合,这个方法用于缩小匹配的范围,用逗号分隔多个表达式
当参数是函数时,函数里面的参数解释如下:
一个函数用来作为测试元素的集合。它接受一个参数index，这是元素在jQuery集合的索引。在函数， this指的是当前的DOM元素。
*/
// $('div').filter('.selectorDemoFirst,.selectorDemoSecond').addClass('hover') ;
$('div').filter(function(index){
if($(this).hasClass('selectorDemoFirst'))
return $(this);
}).addClass('hover') ;
});
</script>
</head>
<body>
<div id='demo'>
<p>This is a p tag text presentation.</p>
<p>This is a p tag text presentation.</p>
<p>This is a p tag text presentation.</p>
<div class='selectorDemoFirst' style='border:1px solid #925CE9;'>
<p>This is a p tag text presentation.</p>
<p>This is a p tag text presentation.</p>
</div>
<p>This is a p tag text presentation.</p>
<div class='selectorDemoSecond' style='border:1px solid #999;margin-bottom: 45px;'>
<span>This is a span tag text presentation</span>
<p>This is a p tag text presentation.</p>
</div>
<div class='selectorDemoSecond' style='border:1px solid #925CE9;'>
<span>This is a span tag text presentation</span>
<p>This is a p tag text presentation.</p>
<span style='padding:8px;'>This is a span tag text presentation</span>
</div>
<p>This is a p tag text presentation.</p>
</div>
</body>
</html>
