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帮朋友查看一个问题，顺便捡一下web开发知识
parent() 方法返回被选元素的直接父元素
测试用例：修改li的父节点的兄弟节点的样式
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<style>
.ancestors *{
display: block;
border: 2px solid lightgrey;
color: lightgrey;
padding: 5px;
margin: 15px;
}
</style>
<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("li").parent().next().css({"color":"red","border":"2px solid red"});
});
</script>
</head>
<body class="ancestors">body (曾曾祖父节点)
<div style="width:500px;">div (曾祖父节点)
<ul>ul (祖父节点)
<li>li (直接父节点)
<span>span</span>
</li>
</ul>
<ul>ul(祖父的兄弟)
</ul>
</div>
</body>
</html>
