JS多级连动菜单_表单特效

<meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> <title>JS联动下拉框</title> <meta name="GENERATOR" content="Microsoft FrontPage 4.0"> <meta name="ProgId" content="FrontPage.Editor.Document"> <meta name="Originator" content="Microsoft Visual Studio .NET 7.1"> <form name="form1" method="post"> <select id="s1" name="s1"><option selected></option></select><select id="s2" name="s2"><option selected></option></select><select id="s3" name="s3"><option selected></option></select><select id="x1" name="x1"><option selected></option></select><select id="x2" name="x2"><option selected></option></select><select id="x3" name="x3"><option selected></option></select><select id="x4" name="x4"><option selected></option></select><select id="x5" name="x5"><option selected></option></select> </form>
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]