文档操作：
内部插入：
a.append(c)： 将c插入到a的内部(标签体)后面
bprepend(c): 将c插入到a内部的前面
a.appendTo(c)：将a插入到c的内部前面
a.prependTo(c):将a插入到c的内部后面
<html>
<head>
<title>01_内部插入节点.html</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<script type="text/javascript" src="../js/jquery-1.11.0.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
//0.获取两个元素
var $city = $("#city");
var $fk = $("#fk");
//1.在city的后面内部追加 反恐
//$city.append($fk);
//2.在city的前面内部插入 反恐
$city.prepend($fk);
});
</script>
</head>
<body>
<ul id="city">
<li id="bj" name="beijing">北京</li>
<li id="tj" name="tianjin">天津</li>
<li id="cq" name="chongqing">重庆</li>
</ul>
<ul id="love">
<li id="fk" name="fankong">反恐</li>
<li id="xj" name="xingji">星际</li>
</ul>
<div id="foo1">Hello1</div>
</body>
<script type="text/javascript">
</script>
</html>
外部插入：
a.after(c):将c放到a的后面
a.before(c)：将c放到a的前面
a.insertAfter(c)：将a放到c的后面
a.insertBefore(c)：将a放到c的前面
<html>
<head>
<title>02_外部插入节点.html</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<script type="text/javascript" src="../js/jquery-1.11.0.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
var $p2 = $("#p2");
var $city = $("#city");
//1.在 p2 的后面插入 city
$p2.after($city);
//2.在 p2 的前面插入 city
$p2.before($city);
});
</script>
</head>
<body>
<ul id="city">
<li id="bj" name="beijing">北京</li>
<li id="tj" name="tianjin">天津</li>
<li id="cq" name="chongqing">重庆</li>
</ul>
<p id="p3">I would like to say: p3</p>
<p id="p2">I would like to say: p2</p>
<p id="p1">I would like to say: p1</p>
</body>
</html>
删除：
empty() 清空元素
remove() 移除元素
<html>
<head>
<title>03_删除节点.html</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<script type="text/javascript" src="../js/jquery-1.11.0.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
var $u1 = $("ul");
//1.清空ul
//$u1.empty();
//2.移除天津 remove
$("#tj").remove();
});
</script>
</head>
<body>
<ul id="city">
<li id="bj" name="beijing">北京<p>海淀区</p></li>
<li id="tj" name="tianjin">天津<p>河西区</p></li>
<li id="cq" name="chongqing">重庆</li>
</ul>
<p class="hello">Hello</p> how are <p>you?</p>
</body>
</html>