ajax跨域访问(cross-domain)

本地站：http://www.somedomain.com

目标站：http://bbs.somedomain.com

解决方法 :

1. 在目标站 document.domain = 'somedomain.com';

并建立一个ajax.html,引用ajax方法 (大家都叫它服务中介)

然后创建一个ajax对象 var webreq = new Ajax();

2. 在本地站 document.domain = 'somedomain.com';

用iframe引用目标站的ajax.html.

 

详细方法:

1. 本地站的一个页面(Test.html)

html:

 

/

 

2. 目标站的ajax.html

Html:

 

----------------------------------------------------------------

目标站： doAjax.aspx

html为空

doAjax.aspx.cs

代码(Page_Load)

Response.Write("看到效果了么？");

return;

 

=====================================================

 

AjaxMethod.js 代码

 

var Try = {
 these: function() {
  var returnValue;
  for (var i = 0; i < arguments.length; i++) {
   var lambda = arguments[i];
   try {
    returnValue = lambda();
    break;
   } catch (e) {}
  }
 //alert(123);
 return returnValue;
 }
}

function grr(rp) {
 if(RegExp.$1)/(.*)/.exec("");
 var re=new RegExp("(.*)");
 re.exec(rp);
 if(RegExp.$1) return RegExp.$1;
 return "";
}

function crr(rp) {
 if(RegExp.$1)/(.*)/.exec("");
 var re=new RegExp("(.*)");
 re.exec(rp);
 if(RegExp.$1) return RegExp.$1;
 return "";
}

var Ajax = function() {}
//var xhr ;这样定义不行
Ajax.prototype.Init = function(){
 return Try.these(
  function() {return new ActiveXObject("Msxml2.XMLHTTP")},
  function() {return new ActiveXObject("Microsoft.XMLHTTP")},
  function() {return new XMLHttpRequest()}
 ) || false;
}

Ajax.prototype.Config = {
 Result:"",
 SucInfo:"",
 FaildInfo:"",
 Url:"",
 returnType:"Compare",  //输入Compare是比较返回的字符是否一致,要指定Result值,//其他返回内容
 ExecFunc:function(ty,W){
  if (typeof ExecResult == 'function')
   ExecResult(ty,W);
 },
 sendData:""
}

var aj = new Ajax();

Ajax.prototype.Action = function(url) {  //同步
 url = url + '&e='+Math.random();
 var xhr = aj.Init();   
 xhr.onreadystatechange = function()
 {
  if (xhr.readyState == 4)
  {
   if (xhr.status == 200)
   {
    aj.FuncResult(aj.Config.Spn,xhr);    
   }
  }
 }
 xhr.open("POST",url,false);
 xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");

xhr.send(null);

}

Ajax.prototype.Actionfor = function(url,spn) {  //异步

url = url + '&e='+Math.random();
 var xhr = aj.Init();  //这样写是为了多异步执行

xhr.onreadystatechange = function()
 {
  if (xhr.readyState == 4)
  {
   if (xhr.status == 200)
   {
    aj.FuncResult(spn,xhr);    
   }
  }
 }
 xhr.open("GET",url,true);

xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
 xhr.send(null); 
}

Ajax.prototype.ActionAlert = function(url) //执行alert提示框的同步
{
 url = url + '&e='+Math.random();
 var xhr = aj.Init();  //这样写是为了多异步执行

xhr.onreadystatechange = function()
 {
  if (xhr.readyState == 4)
  {
   if (xhr.status == 200)
   {
    aj.AlertResult(xhr);    
   }
  }
 }
 xhr.open("GET",url,false);

xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
 xhr.send(null);
}

Ajax.prototype.ActionPost = function(url,spn,W) //同步 send
{
    url = url + '?e='+Math.random();
 var xhr = aj.Init();  //这样写是为了多异步执行

xhr.onreadystatechange = function()
 {
  if (xhr.readyState == 4)
  {
   if (xhr.status == 200)
   {
    aj.postResult(spn,xhr,W);    
   }
  }
 }
 
 try {
     if (netscape.security.PrivilegeManager.enablePrivilege)
     {
            netscape.security.PrivilegeManager.enablePrivilege('UniversalBrowserRead');
            netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
        }
 }catch(e) {};
 
 xhr.open("POST",url,true);
   
 xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
 //xhr.setRequestHeader("Content-Length",pars.length);
 xhr.setRequestHeader("Connection", "open");
 xhr.send(Webreq.Config.sendData);
}

Ajax.prototype.GetJSONData = function(url,spn)
{
    url = url + '?e='+Math.random();
 var xhr = aj.Init();  //这样写是为了多异步执行

xhr.onreadystatechange = function()
 {
  if (xhr.readyState == 4)
  {
   if (xhr.status == 200)
   {
    aj.jsonResult(spn,xhr);    
   }
  }
 }
 
 xhr.open("POST",url,true);
   
 xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
 //xhr.setRequestHeader("Content-Length",pars.length);
 xhr.setRequestHeader("Connection", "open");
 
 xhr.send(null);
}

Ajax.prototype.onResult = function(v) {
 return v==aj.Config.Result;
}

Ajax.prototype.FuncResult = function(spn,xhr)
{  //alert(spn.id);

if (aj.Config.returnType == 'Compare')
 {
  if (aj.onResult(grr(xhr.responseText)))
  {

spn.innerHTML = aj.Config.SucInfo;
   aj.Config.ExecFunc(aj.Config.Result);
   if (aj.Config.Url!='')
   {
    window.location.href = aj.Config.Url;
   }
  }
  else
  {

spn.innerHTML =  aj.Config.FaildInfo;

}
 }
 else
 {
  spn.innerHTML = crr(xhr.responseText);
  aj.Config.ExecFunc(aj.Config.Result);
 }

}

Ajax.prototype.AlertResult = function(xhr)
{
 if (aj.Config.returnType=='Compare')
 {
  if (aj.onResult(grr(xhr.responseText)))
  {
   alert(aj.Config.SucInfo);
   aj.Config.ExecFunc(aj.Config.Result);
  }
  else
  {
   alert(aj.Config.FaildInfo);
  }
 }
 else
 {
  alert(crr(xhr.responseText));
  aj.Config.ExecFunc(aj.Config.Result);
 }
}

Ajax.prototype.postResult = function(spn,xhr,W)
{
    if (aj.Config.returnType == 'Compare')
    {
        if (aj.onResult(grr(xhr.responseText)))
  {
   spn.innerHTML = aj.Config.SucInfo;
   aj.Config.ExecFunc(aj.Config.Result,W);
  }
  else
  {
   spn.innerHTML = aj.Config.FaildInfo;
  }
    }
    else
 {
  spn.innerHTML = crr(xhr.responseText);
  aj.Config.ExecFunc(aj.Config.Result,W);
 }
}

Ajax.prototype.jsonResult = function(spn,xhr)
{
    var jsonstr = xhr.responseText;
    var json = eval_r("return " + jsonstr);
   
    //get data json.something json:{username:"123",content:""};
   
    aj.Config.ExecFunc(aj.Config.Result);
}
///

var WebServices = function() {}
WebServices.Config = {

 

}