登陆界面设计，如果用户名密码为空javascript提醒

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>

<script type="text/javascript">

function checkForm(myform){

var id = myform.id.value;

var password = myform.password.value;

if(id == "") {

alert("名不能为空!");

myform.id.focus();

return false;

}

if(password == "") {

alert("姓不能为空！");

myform.password.focus();

return false;

}

return true;

}

</script>

<table>

<tr><td><img src="note.jpg"></img></td></tr>

</table>

<form action="login_conf.jsp" method="post" name="form1" onsubmit="return checkForm(this);">

<table width=50% align=center>

<tr>

<td colspan=2 align=center>登陆表列</td>

</tr>

<tr align=center>

<td>用户名</td>

<td><input type="text" name="id"></td>

</tr>

<tr align=center>

<td>密 码</td>

<td><input type="password" name="password"></td>

</tr>

<tr align=center>

<td colspan=2>

<input type="submit" value="登陆">

<input type="reset" values="重置">

</td>

</tr>

</table>

</form>