<script type="text/javascript" language="javascript">
function RegisterSubmit(){ //进行表单的非空验证
with (document.register){
var user = loginname.value;
var pass = password.value;
if(user == null || user == ""){//要用或逻辑判断
alert("用户名不能为空！");
}else if(pass == null || pass == ""){//要用或逻辑判断
alert("密码不能为空！");
}else{
document.register.submit();
}
}
}
</script>
</head>
<body>
<form name="register" method="post" action="register.jsp">
<table align="center" style="text-align:center" width="590" border="0">
<tr>
<td><p align="center">用户名：</p></td>
<td align="left"><input type="text" name="loginname" size="20"></td>
</tr>
<tr rowspan="2">
<td> </td>
</tr>
<tr>
<td><p align="center">密 码：</td>
<td align="left"><input type="password" name="password" size="20"></td>
</tr>
<tr rowspan="2">
<td> </td>
</tr>
<tr>
<td><input type="button" value="提交" onClick="RegisterSubmit()"/></td>
<td align="left"><input type="reset" value="重置" name="B2"/></td>
</tr>
</table>
</form>
with (document.register){
var user = loginname.value;
var pass = password.value;
if(user == null || user == ""){//要用或逻辑判断
alert("用户名不能为空！");
}else if(pass == null || pass == ""){//要用或逻辑判断
alert("密码不能为空！");
}else{
document.register.submit();
}
}
}
正解。