没有form表单情况下敲回车键提交表单的js代码

<meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> <title></title> <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>
[ctrl+a 全选 注:如需引入外部js需刷新才能执行]