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var str="<div id=\"aaa\">12</div>";
$(document).ready(function() {
$(str+'> #aaa').append("xxx");
alert(str);
});
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript" language="javascript" src="jquery-1.3.2.min.js"></script>
<script type="text/javascript">
$(function(){
var str="<div id=\'aaa\'>123</div>";
str=$(str); //将字符串封装成 jQuery对象
alert(str.html()); //123
str.append('<b>this is test</b>');
alert(str.html()); //123<b>this is test</b>
});
</script>
</head>
<body>
</body>
</html>