各位大哥帮忙看看,登陆页面没有问题,点击提交就出现了404错误

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>Insert title here</title>

<script type="text/javascript">

  function checkNull(form1){

 /*判断是否有空内容*/

 for(i-0;i<form.length;i++){

 if(form.elements[i]="null"){

 alert("很抱歉,"+form.elements[i].title+"不能为空!");

 form.elements[i].focus();

 return false;

 }

 }

 

 

 /*判断两次密码是否一致*/

 var pwd1=document.getElementById("pwd1_id").value;

 var pwd2=document.getElementById("pwd2_id").value;

 if(pwd1!=pwd2){

 alert("两次密码不一致,请确认!");

 return false;

 }

 /*判断电话号码是否有效*/

 var phone=document.getElementById("phone_id").value;

 var regExpression=/^(86)?((13\d{9})|(15[0,1,2,3,4,5,6,7,8,9]\d{8})|(18[0,5,6,7,8,9]\d{8}))$/;

 var obExp=new RegExp(regexpression);

 if(obExp.test(phone)==false){

 alert("您输入的号码有误!");

 return false;

 }

 /*判断电子邮箱是否有效*/

var email=document.getElementById("email_id").value;

var regExpression=/\w+([-+.]\w+)*@\w([-.]\w+)*\.\w+([-.]\w+)*/;

if(obExp.test(email)==false){

 alert("您输入的邮箱地址不正确!");

 return false;

  }

  }

</script>

</head>

<body>

<form action="form1" method="post" action="" onSubmit="return checkNull(form1)">

<table width="296"   border="0"   align="center"  cellpadding="0"  cellspacing="1"  bgcolor="#333333" >

<tr>

<td colspan="2" bgcolor="#eeeeee">.用户注册</td>

</tr>


<tr>

<td width="200"align="center" bgcolor="#FFFFFF">用户名:</td>

<td width="384"bgcolor="#FFFFFF"><input name="user" type="text" id="user_id" title="用户名">*</td>

</tr>


<tr>

<td align="center" bgcolor="#FFFFFF">密码:</td>

<td bgcolor="#FFFFFF"><input name="pwd" type="password" id="pwd1_id" title="密码">*</td>

</tr>


<tr>

<td align="center" bgcolor="#FFFFFF">确认密码:</td>

<td bgcolor="#FFFFFF"><input name="pwd2" type="password" id="pwd2_id" title="确认密码">*</td>

</tr>


<tr>

<td align="center" bgcolor="#FFFFFF">电话:</td>

<td bgcolor="#FFFFFF"><input name="phone" type="text" id="phone_id" title="电话">*</td>

</tr>


<tr>

<td align="center" bgcolor="#FFFFFF">邮箱:</td>

<td bgcolor="#FFFFFF"><input name="email" type="text" id="email_id" title="邮箱">*</td>

</tr>


<tr>

<td align="center" bgcolor="#FFFFFF">&nbsp;</td>

<td bgcolor="#FFFFFF"><input name="Submit" type="submit" class="btn_grey" value="提交">&nbsp;

<input name="Submit2" type="reset" class="btn_grey" value="重置">

</td>

</tr>

</table>


</form>

</body>

</html>


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