为什么给class=right1的div元素增加内部包裹父容器p之后，div容器会被撑大？
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<title></title>
<script src="http://libs.baidu.com/jquery/1.9.1/jquery.js"></script>
<style>
.left,
.right {
width: 250px;
height: 130px;
border:1px solid black;
}
.left div,
.right div {
width: 100px;
padding: 5px;
margin: 5px;
float: left;
border: 1px solid #ccc;
background: #bbffaa;
}
.right div {
background: yellow;
}
p {
border: 1px solid red;
}
a {
border: 1px solid blue;
}
</style>
</head>
<body>
<h2>DOM包裹wrapInner()方法</h2>
<div class="left">
<div class="aaron1">点击,通过wrapInner方法给所有div元素增加内部父容器p</div>
<div class="aaron2">点击,通过wrapInner的回调方法给每个div元素增加内部父容器a</div>
</div>
<div class="right">
<div class="right1">p元素</div>
<div class="right1">p元素</div>
</div>
<div class="left">
<div class="left1">a元素</div>
<div class="left1">a元素</div>
</div>
<script type="text/javascript">
$(".aaron1").on('click', function() {
//给所有class=right1的div元素，增加内部包裹父容器p
$('.right1').wrapInner('<p></p>');
})
</script>
<script type="text/javascript">
$(".aaron2").on('click', function() {
//wrapInner接受一个回调函数
//每一次遍历this都指向了合集中每一个class=left1的div元素
$('.left1').wrapInner(function() {
return '<a></a>'
})
})
</script>
</body>
v</html>
