<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
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<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<script type="text/javascript" src="https://files.cnblogs.com/flying-tx/3.js"></script>
</head>
<body bgcolor="#E0E0E0" onload="city()">
多级关联菜单：
<form name="frm">
<select id="s1"><option>省份</option></select>
<select id="s2"><option>地级市</option></select>
<select id="s3"><option>市、县级市、县</option></select>
</form>
</body>
</html>
