function CheckUserName(form) {
    if (form.UserName.value.trim() == "") {
        alert("请输入用户名");
        form.UserName.focus();
        return false;
    }
    if (form.Email.value.trim() == "") {
        alert("请输入注册时的E-Mail");
        form.Email.focus();
        return false;
    }
    if (!IsEmail(form.Email.value)) {
        alert("您输入的E-Mail格式不正确");
        form.Email.focus();
        return false;
    }
    $.get(vsite.AjaxUrl + "GetPassword.aspx", { Action: "step1", UserName: form.UserName.value.trim(),
        Email: form.Email.value.trim()
    }, function(data, status) {
        switch (data) {
            case "0": alert("用户名不存在"); break;
            case "1": alert("电子邮箱不正确"); break;
            case "2": alert("注册用户未填写电子邮箱"); break;
            case "3": document.location.href = "?Action=Step2"; break;
            default:
                alert(data); 
                break;
        }
    }, "text");

    return false;
};
function CheckUserMail(form) {
    $.get(AjaxUrl + "GetPassword.aspx", { Action: "checkusername", UserName: form.UserName.value.trim() }, function(data, status) {
        if (data != "1") {
            alert("电子邮件不存在");
            
        }
    }, "text");

    return false;
}
function IsEmail(s) {
    var re = /^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/;
    return re.test(s);
};