一个简单JS的注册 火狐 为什么没效果。

//创建请求对象
var xmlhttp;
if (window.ActiveXObject) {
    xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
else if (window.XMLHttpRequest) {
    xmlhttp = new XMLHttpRequest();
}
// JavaScript Document
function $(element){
return document.getElementById(element);
}
function InitAjax(){
 var ajax = false;
 try 
 {
   ajax = new ActiveXObject("Msxml2.XMLHTTP");
   } 
 catch (e)
 {
   try 
{
    ajax = new ActiveXObject("Microsoft.XMLHTTP");
   } 
catch (E) 
{
    ajax = false;
   }
 }
   if (!ajax && typeof XMLHttpRequest!='undefined')
 {
   ajax = new XMLHttpRequest();
   }
 return ajax;
}
/注册用户名文本框失去焦点，AJAX验证事件
function txtUserNameBlur() {    var varName = document.getElementById("txtUserName").value;    var Reg = "^[A-Za-z0-9]{6,12}$";
    var arrayReg = varName.match(Reg)    //判断用户名是否为空
    if (varName == "") {
        document.getElementById("regUserNameSpan").style.color = "Red";
        document.getElementById("regUserNameSpan").innerText = "Please fill in user account!";
    }
    else {
        if (arrayReg == null) {
            document.getElementById("regUserNameSpan").style.color = "Red";
            document.getElementById("regUserNameSpan").innerText = "User Account 6-12 numbers and letters case!";
        }
        else {
            
            document.getElementById("regUserNameSpan").innerText = "";
            document.getElementById("regUserNameImg").style.display = "block";            //POST传值，Type代表传递类型，在请求页面，通过判断传递类型，从而执行不同的方法
            var varData = "RegName=" + encodeURI(varName) + "&Type=RegUserName";            xmlhttp.open("POST", "AjaxRequest/AjaxRequestPage.aspx",true);
            xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
            xmlhttp.send(varData);
            xmlhttp.onreadystatechange = txtUserNameBlurCallBack;
            
        }
    }
}//注册用户名文本框失去焦点，AJAX验证事件回调函数
function txtUserNameBlurCallBack() {
    if (xmlhttp.readyState == 4) {
        if (xmlhttp.status == 200) {
            document.getElementById("regUserNameImg").style.display = "none";
            if (xmlhttp.responseText == "1") {
                document.getElementById("regUserNameSpan").style.color = "Red";
                document.getElementById("regUserNameSpan").innerText = "The user name already exists, please re-fill!";
            }
            else {
                document.getElementById("regUserNameSpan").style.color = "Green";
                document.getElementById("regUserNameSpan").innerText = "The user name can be used!";
            }
        }
    }
}//用户密码验证
function txtUserPwdBlur() {    var varPwd = document.getElementById("txtUserPwd").value;    var Reg = "^[A-Za-z0-9]{6,12}$";
    var arrayReg = varPwd.match(Reg)    if (varPwd == "") {
        document.getElementById("regUserPwd").style.color = "Red";
        document.getElementById("regUserPwd").innerText = "Please fill out the user password!";
    }
    else {
        if (arrayReg == null) {
            document.getElementById("regUserPwd").style.color = "Red";
            document.getElementById("regUserPwd").innerText = "Password composed of letters and numbers 0-9 6-12 !";
        }
        else {
            document.getElementById("regUserPwd").style.color = "Green";
            document.getElementById("regUserPwd").innerText = "Fill in the correct user password!";
        }
    }
}//用户重复密码验证
function txtUserAgainPwdBlur() {    var varPwd = document.getElementById("txtUserPwd").value;
    var varAgainPwd = document.getElementById("txtUserAgainPwd").value;
    var Reg = "^[A-Za-z0-9]{6,12}$";
    var arrayReg = varAgainPwd.match(Reg)    if (varAgainPwd == "") {
        document.getElementById("regUserAgainPwd").style.color = "Red";
        document.getElementById("regUserAgainPwd").innerText = "Please fill in the password again!";
    }
    else {
        if (arrayReg == null || varPwd != varAgainPwd) {
            document.getElementById("regUserAgainPwd").style.color = "Red";
            document.getElementById("regUserAgainPwd").innerText = "Fill is not the same password twice!";
        }
        else {
            document.getElementById("regUserAgainPwd").style.color = "Green";
            document.getElementById("regUserAgainPwd").innerText = "Fill in the correct password, thank you!";
        }
    }
}//用户手机号码验证
function txtphoneBlur() {    var varPhone = document.getElementById("txtPhone").value;
    var Regphone = "\d[11]";
    var arrayRegRegphone = varPhone.match(Regphone)
    
    if (varPhone == "") {
        document.getElementById("regPhone").style.color = "Red";
        document.getElementById("regPhone").innerText = "Please fill out the contact 11 real numbers";
    }
//    else {
//        if (arrayRegRegphone.length != "11") {
//            document.getElementById("regPhone").style.color = "Red";
//            document.getElementById("regPhone").innerText = "用户号码11位填写";
//        }
        else {
            document.getElementById("regPhone").style.color = "Green";
            document.getElementById("regPhone").innerText = "Fill in the correct, thank you!";
        //}
    }
}
//用户邮件验证
function txtEmailBlur() {    var varEmail = document.getElementById("txtemail").value;
    var RegEmail =/^([a-zA-Z0-9]+[_|\_|\.]?)*[a-zA-Z0-9]+@([a-zA-Z0-9]+[_|\_|\.]?)*[a-zA-Z0-9]+\.[a-zA-Z]{2,3}$/;    var arrayRegEmail = varEmail.match(RegEmail);
    
    if (varEmail == "")
     {
        document.getElementById("regemail").style.color = "Red";
        document.getElementById("regemail").innerText = "Please fill in Email!";
    }
    else {
 
              if(arrayRegEmail==null)
              {
             
               document.getElementById("regemail").style.color = "Red";
               document.getElementById("regemail").innerText = "Please fill in the correct Email!";              }
              else
              {
                
                document.getElementById("regemail").innerText = "";
                document.getElementById("regemaliImg").style.display = "block";
                
                //POST传值，Type代表传递类型，在请求页面，通过判断传递类型，从而执行不同的方法
                 var varData = "email=" + encodeURI(varEmail) + "&type=RegUseremail";
                 xmlhttp.open("POST", "AjaxRequest/AjaxPage.aspx",true);
                 xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
                
                 xmlhttp.send(varData);
                 xmlhttp.onreadystatechange = txtEmailBlurCallBack;
       }
       
    }
}//email文本框失去焦点，AJAX验证事件回调函数
function txtEmailBlurCallBack() {   if (xmlhttp.readyState == 4) {
        if (xmlhttp.status == 200) {
       
            document.getElementById("regemaliImg").style.display = "none";
            if (xmlhttp.responseText == "1") {
                document.getElementById("regemail").style.color = "Red";
                document.getElementById("regemail").innerText = "You fill in the Email already exists!";
            }
            else {
                document.getElementById("regemail").style.color = "Green";
                document.getElementById("regemail").innerText = "You can use this Email!";
                
            }
        }
    }
}//验证码
function txtUserCodeBlur() {    var varPwd = document.getElementById("txtcode").value;
    var a=document.cookie.split('CheckCode=');
    var b=a[1].split(';');
    if (varPwd == "") {
        document.getElementById("regcode").style.color = "Red";
        document.getElementById("regcode").innerText = "Please fill out the verification code!";
    }
    else if (varPwd != b){
            document.getElementById("regcode").style.color = "Red";
            document.getElementById("regcode").innerText = "Verification code error, case sensitive!";
        }
        
        else {
            document.getElementById("regcode").style.color = "Green";
            document.getElementById("regcode").innerText = "Fill in the correct!";
        }
}//返回按钮点击事件
function btnBackClick() {
    window.location = "Index.aspx";
}//注册验证功能
function btnRegClick() {    //根据颜色判断是否验证成功
   // var colorUserName = document.getElementById("regUserNameSpan").style.color;
    var colorUserPwd = document.getElementById("regUserPwd").style.color;
    var colorUserAgainPwd = document.getElementById("regUserAgainPwd").style.color;
    //var colorUserRealName = document.getElementById("regUserRealName").style.color;
   
    //var colorUserPhone = document.getElementById("regPhone").style.color;
    //var colorUserQQ = document.getElementById("regQQ").style.color;
    var colorUserEmail = document.getElementById("regemail").style.color;
    //var colorUserquestion = document.getElementById("regquestion").style.color;
   // var colorUsereanswer = document.getElementById("reganswer").style.color;
   var colorcode = document.getElementById("regcode").style.color;
    if (colorUserPwd != "green") {
        txtUserPwdBlur();
        return false;
    }
    if (colorUserAgainPwd != "green") {
        txtUserAgainPwdBlur();
        return false;
    }    if (colorUserEmail != "green") {
        txtEmailBlur();
        return false;
    }
     if (colorcode != "green") {
        txtUserCodeBlur();
        return false;
    }    return true;
}