<style>
	.wraall01 div,.wraall01 strong	{margin:10px;padding:10px;}
	.wraall01 .div01	{border:dotted 1px red;}
	.wraall01 .div02	{border:dotted 1px blue;}
	.wraall01 .div03	{border:dotted 1px green;}
</style>
<script>
	$(function(){
		$('.wraall01 strong,.wraall01 .div02').wrapAll('<div class="div03"></div>');
	});
</script>
<div class="wraall01">
	<div class="div01">要素1</div>
	<strong>要素2</strong>
	<div class="div02">要素3</div>
</div>