没有form表单情况下敲回车键提交表单的js代码

<html> <head> <title></title> <script type="text/javascript"> function enterPress(e) { if (e.keyCode == 13) { login(); } } function login(){ //登录验证等 alert('login'); } </script> </head> <body> <table id='logintable' border="1" cellpadding="0" cellspacing="0"> <tr> <td> Username:<input id="userName" type="text" name="userName" style="width: 90px;" onkeydown="javascript: enterPress(event);"/> </td> <td> Password:<input id="password" type="password" name="password" style="width: 90px;" onkeydown="javascript: enterPress(event);"/> </td> <td> <input id="login" type="button" value="Login" onclick="login()" /> </td> </tr> </table> </body> </html>
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]