<!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=utf-8" />
<title>無標(biāo)題文檔</title>
<style type="text/css">
</style>
<script type="text/javascript" src="jQuery/jquery-1.12.1.js"></script>
<script type="text/javascript">
$(function(){
	$("#btn").click(function(){
			$("#info").html("div4的父親"+$("#div4").parent().attr("id"));
  });
});
</script>
</head>
<body>
<input type="button" value="點擊" id="btn"><div id="info"></div>
<div id="div1">
 <div id="div2">
  <div id="div3">
    <div id="div4">
  		</div>
  </div>
 </div>
</div>

</body>
</html>

2.parents()

遍歷它的所有祖先

.each(function(i,e){})

對其中的每個元素進(jìn)行遍歷

其中i是索引，e是當(dāng)前對象，相當(dāng)于$(this),但是前者是js對象，后者是jquery對象。

<!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=utf-8" />
<title>無標(biāo)題文檔</title>
<style type="text/css">
</style>
<script type="text/javascript" src="jQuery/jquery-1.12.1.js"></script>
<script type="text/javascript">
$(function(){
	$("#btn").click(function(){
			$("#div4").parents().each(function(i, e) {
        $("#info").html($("#info").html()+"第"+i+"個祖先是,("+$(this).attr("id")+")");
      });
  });
});
</script>
</head>
<body>
<input type="button" value="點擊" id="btn"><div id="info"></div>
<div id="div1">
 <div id="div2">
  <div id="div3">
    <div id="div4">
  		</div>
  </div>
 </div>
</div>

</body>
</html>

那你就會問了第三個和第四個祖先是什么鬼讓我們在網(wǎng)頁中按F12調(diào)試一下看看結(jié)果

當(dāng)i=3 也就是到了第三個祖先結(jié)果是body

當(dāng)i=4 也就是到了第四個祖先結(jié)果是html

3.parentsUntil()

遍歷到指定的祖先(不包括該祖先)

<!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=utf-8" />
<title>無標(biāo)題文檔</title>
<style type="text/css">
</style>
<script type="text/javascript" src="jQuery/jquery-1.12.1.js"></script>
<script type="text/javascript">
$(function(){
	$("#btn").click(function(){
			$("#div4").parentsUntil("#div1").each(function(i, e) {
        $("#info").html($("#info").html()+"第"+i+"個祖先是,("+$(this).attr("id")+")");
      });
  });
});
</script>
</head>
<body>
<input type="button" value="點擊" id="btn"><div id="info"></div>
<div id="div1">
 <div id="div2">
  <div id="div3">
    <div id="div4">
  		</div>
  </div>
 </div>
</div>

</body>
</html>