| children(selector) | $(“ul”).children(“li”) | 相当于$(“ul>li”)，子类选择器 |
| find(selector) | $(“ul”).find(“li”); | 相当于$(“ul li”),后代选择器 |
| siblings(selector) | $(“#first”).siblings(“li”); | 查找兄弟节点，不包括自己本身。 |
| parent() | $(“#first”).parent(); | 查找父亲 |
| eq(index) | $(“li”).eq(2); | 相当于$(“li:eq(2)”),index从0开始 |
| next() | $(“li”).next() | 找下一个兄弟 |
| prev() | $(“li”).prev() |
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style type="text/css">
* {
margin: 0;
padding: 0;
}
ul {
list-style: none;
}
.wrap {
width: 330px;
height: 30px;
margin: 100px auto 0;
padding-left: 10px;
background-image: url(img/bg.jpg);
}
.wrap li {
background-image: url(img/libg.jpg);
}
.wrap > ul > li {
float: left;
margin-right: 10px;
position: relative;
}
.wrap a {
display: block;
height: 30px;
width: 100px;
text-decoration: none;
color: #000;
line-height: 30px;
text-align: center;
}
.wrap li ul {
position: absolute;
top: 30px;
display: none;
}
</style>
</head>
<body>
<div class="wrap">
<ul>
<li>
<a href="javascript:void(0);">一级菜单1</a>
<ul class="ul">
<li><a href="javascript:void(0);">二级菜单11</a></li>
<li><a href="javascript:void(0);">二级菜单12</a></li>
<li><a href="javascript:void(0);">二级菜单13</a></li>
</ul>
</li>
<li>
<a href="javascript:void(0);">一级菜单2</a>
<ul>
<li><a href="javascript:void(0);">二级菜单21</a></li>
<li><a href="javascript:void(0);">二级菜单22</a></li>
<li><a href="javascript:void(0);">二级菜单23</a></li>
</ul>
</li>
<li>
<a href="javascript:void(0);">一级菜单3</a>
<ul>
<li><a href="javascript:void(0);">二级菜单31</a></li>
<li><a href="javascript:void(0);">二级菜单32</a></li>
<li><a href="javascript:void(0);">二级菜单33</a></li>
</ul>
</li>
</ul>
</div>
</body>
</html>
<script src="./jquery-1.12.4.js"></script>
<script>
$(document).ready(function(){
var $li=$('.wrap>ul>li');
$li.mouseenter(function(){
$(this).children('ul').show();
})
$li.mouseleave(function(){
$(this).children('ul').hide();
})
})
</script>
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