wrap ：把所有匹配的元素，用其他元素的结构化包裹起来
wrapAll : 把所有匹配的元素，用单个元素包裹起来
wrapInner : 把匹配元素的子类用html结构包裹起来
二、实例
（1）wrap
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="../jquery-2.0.0/jquery-2.0.0.js"></script>
<script type="text/javascript">
$(function() {
$("div a").wrap("<div id='id'></div>");
});
</script>
</head>
<body>
<div>
<a>liuxingyu</a> <a>liuxingyu</a> <a>liuxingyu</a> <a>liuxingyu</a>
</div>
</body>
</html>
firebug显示结果：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script src="../jquery-2.0.0/jquery-2.0.0.js" type="text/javascript">
<script type="text/javascript">
</head>
<body>
<div>
<div id="id">
<a>liuxingyu</a>
</div>
<div id="id">
<a>liuxingyu</a>
</div>
<div id="id">
<a>liuxingyu</a>
</div>
<div id="id">
<a>liuxingyu</a>
</div>
</div>
</body>
</html>
（2）wrapAll
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="../jquery-2.0.0/jquery-2.0.0.js"></script>
<script type="text/javascript">
$(function() {
$("div a").wrapAll("<div id='id'></div>");
});
</script>
</head>
<body>
<div>
<a>liuxingyu</a> <a>liuxingyu</a> <a>liuxingyu</a> <a>liuxingyu</a>
</div>
</body>
</html>
firebug显示结果：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script src="../jquery-2.0.0/jquery-2.0.0.js" type="text/javascript">
<script type="text/javascript">
$(function() {
$("div a").wrapAll("<div id='id'></div>");
});
</script>
</head>
<body>
<div>
<div id="id">
<a>liuxingyu</a> <a>liuxingyu</a> <a>liuxingyu</a> <a>liuxingyu</a>
</div>
</div>
</body>
</html>
（3）wrapInner
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script src="../jquery-2.0.0/jquery-2.0.0.js" type="text/javascript">
<script type="text/javascript">
$(function() {
$("div").wrapInner("<div id='id'></div>");
});
</script>
</head>
<body>
<div>
<a>liuxingyu</a> <a>liuxingyu</a> <a>liuxingyu</a> <a>liuxingyu</a>
</div>
</body>
</html>
firebug显示结果：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script src="../jquery-2.0.0/jquery-2.0.0.js" type="text/javascript">
<script type="text/javascript">
$(function() {
$("div").wrapInner("<div id='id'></div>");
});
</script>
</head>
<body>
<div>
<div id="id">
<a>liuxingyu</a> <a>liuxingyu</a> <a>liuxingyu</a> <a>liuxingyu</a>
</div>
</div>
</body>
</html>