Manipulation/API/jQuery - Sample Code
wrapInner(elem)
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<script src="/jquery/js/jquery.js"></script>
<script>
$(document).ready(function(){
$("p").wrapInner(document.createElement("b"));
});
</script>
<style>p { background:#9f9; }</style>
</head>
<body>
<p>Hello</p>
<p>cruel</p>
<p>World</p>
</body>
</html>
[実行結果]