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parents([expr])
概述
取得一个包含着所有匹配元素的祖先元素的元素集合（不包含根元素）。可以通过一个可选的表达式进行筛选。
参数
expr StringV1.0
用于筛选祖先元素的表达式
示例
描述:
找到每个span元素的所有祖先元素。
HTML 代码:
<html><body><div><p><span>Hello</span></p><span>Hello Again</span></div></body></html>
jQuery 代码:
$("span").parents()描述:
找到每个span的所有是p元素的祖先元素。
jQuery 代码:
$("span").parents("p")