前辈 请问下面的代码怎么解释？
原地址
http://www.w3school.com.cn/tiy/t.asp?f=jquery_parent
<!DOCTYPE html>
<html>
<head>
<style>
.ancestors *
{
display: block;
border: 2px solid lightgrey;
color: lightgrey;
padding: 5px;
margin: 15px;
}
</style>
<script src="/jquery/jquery-1.11.1.min.js">
</script>
<script>
$(document).ready(function(){
$("span").parent().css({"color":"red","border":"2px solid red"});
});
</script>
</head>
<body>
<div class="ancestors">
<div style="width:500px;">div (曾祖父)
<ul>ul (祖父)
<li>li (直接父)
<span>span</span>
</li>
</ul>
</div>
<div style="width:500px;">div (祖父)
<p>p (直接父)
<span>span</span>
</p>
</div>
</div>
</body>
</html>
