ajax 检测用户名是否被占用

答案：
//检测用户名是否被占用
function GetO(){
    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;
}
function getResult(serverPage) { 
 var ajax = GetO();
  var sep = (-1 < serverPage.indexOf("?")) ? "&" : "?" 
  var newurl = serverPage + sep + "__=" + encodeURIComponent((new Date()).toString());

  ajax.open("GET", newurl, true); 
  ajax.onreadystatechange = function() { 
        if (ajax.readyState == 4 && ajax.status == 200) { 
   if(ajax.responseText==1){
    ShowResult(1,"您的用户名可以正常注册")
    AjaxResult=true;
   }else{
    ShowResult(0,"您的用户名被占用了")
    AjaxResult=false;
   }
        } 
    } 
    ajax.send(null); 

}
function chkUsername(){
 var sflag;//标记;
 var sErr;//错误信息;
 sflag=true;

 var re=/^\w{2,20}$/;
 if(!re.test(document.Form1.UserName.value)){
  sflag=false;
  sErr="用户名只能输入字母、数字或下划线";
 }

 if (document.Form1.UserName.value.length>20||document.Form1.UserName.value.length<2){
  sflag=false;
  sErr="用户名长度必须在2~20个字符之间";
 } 
 if (document.Form1.UserName.value=="" ){
  sErr="用户名不能为空";
  sflag=false;
 }
 //ajax检测返回结果
 if (!sflag) {
  ShowResult(0,sErr)
 }else{
  getResult("../MemberCheck.aspx?t=1&Name=" + document.Form1.UserName.value);
 }

 //document.getElementById("spname").innerHTML=ss;
}
function ShowResult(tag,str){
 var obj = document.getElementById("spname"); 
 if(tag==0){
  obj.style.border="1px solid red";
  obj.style.color="red";

 }else{
  obj.style.border="1px solid green";
  obj.style.color="green";
 }
  obj.innerHTML=str;
  obj.style.padding="1px";
}
//取ajax返回的用户问题值
function getQuestionData(sPage){ 
 var ajax = GetO();
  var sep = (-1 < sPage.indexOf("?")) ? "&" : "?" 
  var newurl = sPage + sep + "__=" + encodeURIComponent((new Date()).toString());

  ajax.open("GET", newurl, true); 
  ajax.onreadystatechange = function() { 
        if (ajax.readyState == 4 && ajax.status == 200) { 
   if(ajax.responseText==""){
    document.getElementById("getstate").innerHTML="用户不存在!"
   }
   else{
    document.g.Question.value=ajax.responseText;
    document.g.Question.readOnly=true;
    document.getElementById("getpwdstep1").style.display="none";
    document.getElementById("getpwdstep2").style.display="block";
    document.getElementById("getstate").innerHTML="";

   }
        } 
    } 
    ajax.send(null); 
}
function getUserQ(){
 //改变报错span的显示样式
 document.getElementById("getstate").style.padding="1px 4px";
 if (document.g.UserName.value==""){
  document.getElementById("getstate").innerHTML="用户名不能为空!"
 }else{
  document.getElementById("getstate").style.background="red";
  document.getElementById("getstate").style.color="white";
  document.getElementById("getstate").innerHTML="正在加载数据...";
  //设置ajax
  getQuestionData("../MemberCheck.aspx?t=2&gName=" + document.g.UserName.value);
 }
}


function login(n,p,t)
{
 if(t==false){
  document.getElementById("pLogin").style.display="none";
  document.getElementById("LoginInfo").innerHTML="正在帮您登录，请稍等...";
 }
 var request;
 if(undefined == request){
  request = new Request();
 }

 if(undefined == request._get){
  //不支持Ajax获取数据;
  if(t==false){
   document.getElementById("pLogin").style.display="";
   document.getElementById("LoginInfo").innerHTML="不能获取数据";
  }
 }
 else{
  userName=n;
  toPrev=t;
  request.GetNoCache(loginPath + "LoginCheck.aspx" + "?n=" + n + "&p=" + p,loginCheck);
 }
}
function loginCheck(result)
{
 if (result.readyState!=ReadyState.Complete)
  return;
 //成功获取;     
 if (result.status==HttpStatus.OK && result.responseText != "")
 {
  //执行返回的语句;
  //alert(result.responseText);
  if (result.responseText=='1')
  {
   if(toPrev ==false){
    document.getElementById("LoginInfo").innerHTML='<ul><li>欢迎' + userName + '</li><li><a href=>   }
   else{
    if(UrlPrev != ''){
     document.location.href=>    }
    else{
     document.location.href=>    }
   }
   return;
  }
  else
  {
   if(document.location.href !="http://" + document.location.hostname + loginPath + "Member/Login.aspx")
    document.location.href=>  }
 }
 else
 {
  //失败;
  document.location.href=>  return;
 }
}
function checkKey(caputureKey,n,p,t){
 var key = window.event.keyCode;
 if(key == caputureKey){
  login(n,p,t);
 }
}
function setLoginInfo(bLogin){
 if(bLogin){
  document.getElementById("LoginInfo").innerHTML='<ul><li>欢迎' + userName + '</li><li><a href=> }
 else{
 }
}
function gotoUrl(s){
 window.location.href=>}

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