注册页面，当填的信息格式不正确时，会提示错误，点击了确定以后，不会停留在注册页面而是会提示注册成功？？？？？
求解决啊！！谢谢了
<!DOCTYPE>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="keywords" content="用户登录">
<meta name="description" content="用户登录">
<title>用户注册</title>
<link rel="stylesheet" type="text/css" href="../css/general.css">
<link rel="stylesheet" type="text/css" href="../css/login.css">
<script type="text/javascript" src="../js/jquery.js"></script>
<script type="text/javascript" src="../js/general.js"></script>
<script src="../js/jquery.validate.min.js"></script>
</head>
<body>
<!-- 头部开始 -->
<div class="header">
<div class="w900 mt30 cut">
</div>
</div>
<!-- 头部结束 -->
<!-- 主体开始 -->
<div class="container w900 mt20">
<div class="wbox cut">
<div class="login-banner fl cut"></div>
<form method="post" action="doregist.php" id="regform" >
<input type="password" value="" class="hide">
<div class="login ml530">
<h2 class="c666">用户注册</h2>
<dl class="username mt20">
<dt><i class="icon"></i></dt>
<dd><input name="username" id="username" type="text" placeholder="请输入用户名" required></dd>
</dl>
<dl class="pwd mt20">
<dt><i class="icon"></i></dt>
<dd><input name="password" id="password" type="password" placeholder="请输入密码" required></dd>
</dl>
<dl class="pwd mt20">
<dt><i class="icon"></i></dt>
<dd><input name="tel" id="tel" type="text" placeholder="手机号" required></dd>
</dl>
<dl class="pwd mt20">
<dt><i class="icon" ></i></dt>
<dd><input name="sex" id="sex" type="text" placeholder="性别" required></dd>
</dl>
<dl class="pwd mt20">
<dt><i class="icon"></i></dt>
<dd><input name="email" id="email" type="text" placeholder="邮箱" required></dd>
</dl>
<dl class="pwd mt20">
<dt><i class="icon"></i></dt>
<dd><input name="address" id="address" type="text" placeholder="地址" required></dd>
</dl>
<!-- -->
<div class="ck module mt20 cut">
<div class="fl"></div>
<div class="fr"></div>
</div>
<input class="form-submit aln-c radius4 mt20" type="submit" onclick="check()" value="注 册">
</div>
</form>
</div>
</div>
<!-- 主体结束 -->
<div class="cl"></div>
<!-- 页脚开始 -->
<div class="footer mt20">
<div class="links radius4 mt20">
</div>
</div><!-- 页脚结束 -->
<script type="text/javascript">
function check() {
var username=document.getElementById("username");
var password=document.getElementById("password");
var sex=document.getElementById("sex");
var tel=document.getElementById("tel");
var email=document.getElementById("email");
var address=document.getElementById("address");
if(username.value==""){
alert("用户名不能为空");
return false;
}else if(username.value.lenth<2||username.value.lenth>8){
alert("用户名长度不符合要求\n用户名长度为2-8个字符");
return false;
}else if(password.value.lenth<6||password.value.lenth>12){
alert("密码长度不符合要求\n密码长度为6-12个字符");
return false;
}else if(email.value.indexOf(".")<0||email.value.indexOf("@")<0){
alert("邮箱名错误")
form.email.focus();
return false;
}else if(sex.value==""){
alert("性别不能为空");
return false ;
}else if(!(/^1(3|4|5|6|7|8|9)\d{9}$/.test(tel.value))){
alert("手机号格式不正确");
return false;
}else if(address.value==""){
alert("地址不能为空");
return false;
}
else {
return true;
}
}
/*$().ready(function() {
// 在键盘按下并释放及提交后验证提交表单
$("#regform").validate();
})*/
</script>
</body></html>
