学习jQuery中的层级查找方式

本文实例分析了jQuery的层级查找方式。分享给大家供大家参考，具体如下：

下面使用jquery的层级查找方式

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<script src="jquery-1.6.2.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(
  function(){
    /*第一种方式层级查找,查找的是a标签对象——选择器*/
    $('.thumb-hover a:has(img)').each(function(){
       alert($(this).attr("pid"));
    });
    /*第三种层级查找，使用方法进行筛选——筛选器*/
    $('.thumb-hover a').has("img").each(function(){
       alert($(this).attr("pid"));
    });
    /*第二种方式层级查找，查找的是img标签对象——基本层级选择器*/
    $('.thumb-hover a img').each(function(){
      alert($(this).attr("alt"));
    });
  }
);
</script>
<title>无标题文档</title>
</head>
<DIV class=thumb sizcache="17" sizset="84">
  <SPAN class=thumb-hover sizcache="17" sizset="84">
  <A class=lightbox-enabled href="/user/showuser.php?uid=u1373373094&tab=photo&view=photo_detail&pid=72464692#detail" target=_blank pid="72464692" oid="27" src="http://pic03.babytreeimg-dev.com/foto3/thumbs/2012/0106/43/8/51dc02a6279c0ef6c728e5_mb.jpg" jQuery1640004568396895048288="1">
  <IMG alt=DSC_0723.JPG src="http://pic05.babytreeimg-dev.com/foto3/thumbs/2012/0106/43/8/51dc02a6279c0ef6c728e5_sm.jpg"> </A>
  <SPAN style="DISPLAY: none" id=72464692 class=mouse-wrap>
  <IMG class=unselect src="http://pic.babytree.com/img/mybabytree/photo/pix.png">
  </SPAN> 
  </SPAN>
</DIV>
<DIV class=thumb>
  <SPAN class=thumb-hover sizcache="0" sizset="2">
  <A class=lightbox-enabled href="/user/showuser.php?uid=u3073373044&tab=photo&view=photo_detail&pid=72464732#detail" target=_blank pid="72464732" oid="5" src="http://pic02.babytreeimg-dev.com/foto3/thumbs/2012/0216/48/9/b72ff3742c8c172650a0d1_nb.jpg" jQuery16405726906849340585="1"><IMG alt=Koala.jpg src="http://pic01.babytreeimg-dev.com/foto3/thumbs/2012/0216/48/9/b72ff3742c8c172650a0d1_sm.jpg"> </A>
  <SPAN style="DISPLAY: none" id=72464732 class=mouse-wrap>
  <IMG class=unselect alt=DSC_0724.JPG src="http://pic.babytree.com/img/mybabytree/photo/pix.png">
  </SPAN> 
  </SPAN>
</DIV>
<body>
</body>
</html>