<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>修改代码，右边会自动显示结果</title>
<!--适应移动端-->
<meta name="viewport" content="width=device-width, initial-scale=1">
<!--css样式-->
<!--引用jquery库-->
<script src="https://s1.pstatp.com/cdn/expire-1-M/jquery/1.10.2/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$(".btn1").click(function(){
$("p").wrap("<div></div>");
});
});
</script>
<style type="text/css">
div{background-color:yellow;}
</style>
</head>
<body>
<p>This is a paragraph.</p>
<p>This is another paragraph.</p>
<button class="btn1">用 div 包裹每个段落</button>
</body>
</html>
