帮我看看这个问题的原因
源代码如下:
<%@ page contentType= "text/html; charset=gb2312 " language= "java "
errorPage= " " %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN " "http://www.w3.org/TR/html4/loose.dtd ">
<html>
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=gb2312 ">
<title> 注册 </title>
</head>
<script language= "javascript ">
function regist()
{
if(document.form1.company.value== " " || document.form1.company.value==null)
window.alert( "请输入公司名! ");
if(document.form1.principal.value== " " || document.form1.principal.value==null)
window.alert( "请输入负责人! ");
if(document.form1.operation.value== " " || document.form1.operation.value==null)
window.alert( "请输入公司性质! ");
if(document.form1.password.value== " " || document.form1.password.value=null)
window.alert( "请输入密码! ");
if(document.form1.tel.value== " " || document.form1.tel.value==null)
window.alert( "请输入电话号码! ");
if(document.form1.email.value== " " || document.form1.email.value==null)
window.alert( "请输入电子邮件! ");
}
</script>
<body>
<form name= "form1 " method= "post " action= " ">
<table width= "574 " height= "222 " border= "1 " align= "center ">
<tr>
<td colspan= "2 "> <div align= "center ">
<h1> <strong> 注册 </strong> </h1>
</div> </td>
</tr>
<tr>
<td width= "211 ">
<div align= "right "> 公司名 : </div> </td>
<td width= "347 "> <input type= "text " name= "company "> </td>
</tr>
<tr>
<td>
<div align= "right "> 负责人 : </div> </td>
<td> <input type= "text " name= "principal "> </td>
</tr>