☆ 遍历 - .parent() 方法: 查找每个段落的带有 "selected" 类的父元素：
<body>
<ul class="level-1">
<li class="item-i">I</li>
<li class="item-ii">II
<ul class="level-2">
<li class="item-a">A</li>
<li class="item-b">B
<ul class="level-3">
<li class="item-1">1</li>
<li class="item-2">2</li>
<li class="item-3">3</li>
</ul>
</li>
<li class="item-c">C</li>
</ul>
</li>
<li class="item-iii">III</li>
</ul>
<script>
$('li.item-a').parent().css('background-color', 'red');//class="item-a"所在的容器的环境 的背景色都改为red ($('li.item-a').parent(): 找到它的宿主)
</script>
</body>
☆ <!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="http://cdn.static.runoob.com/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("span").parent().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>
</div>
</body>
</html>
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