要做一个登录检验用户名和密码都不能为空的Javascript代码怎么写？不连接数据库！
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<HTML>
<head>
<script language= "JavaScript " type= "text/JavaScript ">
<!--
function check(form){
//检查姓名是否填写
var username = form.username.value;
if(username.length==0){
alert( "请填写用户名！ ");
form.username.focus();
return false;
}
var password = form.password.value;
if(password.length==0){
alert( "请填写密码！ ");
form.password.focus();
return false;
}
}
//-->
</script>
</head>
<body>
<form name= "login " method= "post " action= "do_login.jsp " onSubmit= "return check(this); ">
用户： <input class= "login-input " type= "text " name= "username "> <br />
密码： <input class= "login-input " type= "password " name= "password "> <br />
<input type= "submit " value= "确认 " style= "margin-top:8px ">
<input type= "reset " value= "取消 ">
</form>
</body>
</HTML>
<head>
<script language= "JavaScript " type= "text/JavaScript ">
<!--
function check(form){
//检查姓名是否填写
var username = form.username.value;
if(username.length==0){
alert( "请填写用户名！ ");
form.username.focus();
return false;
}
var password = form.password.value;
if(password.length==0){
alert( "请填写密码！ ");
form.password.focus();
return false;
}
}
//-->
</script>
</head>
<body>
<form name= "login " method= "post " action= "do_login.jsp " onSubmit= "return check(this); ">
用户： <input class= "login-input " type= "text " name= "username "> <br />
密码： <input class= "login-input " type= "password " name= "password "> <br />
<input type= "submit " value= "确认 " style= "margin-top:8px ">
<input type= "reset " value= "取消 ">
</form>
</body>
</HTML>
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