<html>
<head>
<script type="text/javascript" src="/jquery/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function(){
p=$("p").clone();
$("button").click(function(){
$("body").append(p);
});
});
</script>
</head>
<body>
<p>This is a paragraph.</p>
<button>复制每个 p 元素，然后追加到 body 元素</button>
</body>
</html>
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