如何解决跨域问题？ [英] How to solve the problem of cross domain?

问题描述

您好，我已经设计了一个窗口表单应用程序，我在其中调用了一个jQuery。脚本正在关注

 < script    类型  =  text / javascript >  
  var 电子邮件; 
  var  pwd; 
 function loginuser（email，pwd）{
 
  var  query = '  aUserName =' + email + ' & aPassword =' + pwd; 
 
函数makeRequest（url）{
 
  if （window.XMLHttpRequest）{
 
 httpRequest =  new  XMLHttpRequest（）; 
 
} 
  else   if （window.ActiveXObject）{
 尝试 {
 
 httpRequest =  new  ActiveXObject（  Msxml2.XMLHTTP）; 
} 
  catch （e）{
  try  {
 httpRequest =  new  ActiveXObject（  Microsoft.XMLHTTP ）; 
} 
  catch （e）{} 
} 
} 
 
  if （！httpRequest）{
 
 alert（' 放弃:(无法创建XMLHTTP实例'）; 
  return   false ; 
} 
 httpRequest.onreadystatechange = alertContents; 
 
 httpRequest.open（'  GET'，url）; 
 
 httpRequest.send（）; 
 
} 
 
 
 
 
 function alertContents（）{
 
 
  if （httpRequest.readyState ===  4 ）{
  if （httpRequest.status ===  200 ）{
 alert（httpRequest.status）; 
  //   httpRequest.open（GET，window.location.href，false）;  
  //   httpRequest.responseType =document;  
  //   httpRequest.send（）;  
 
  if （httpRequest.response）{
 
  var  info = JSON.parse（httpRequest.response）; 
 
  if （info.Error）{
 
 alert（  此次请求无法完成。请稍后再试。）; 
 loader（  unlock）; 
} 
  else  {
 checkCookie（）; 
} 
}  else  {
 console.log（ < span class =code-string>忽略空值）; 
 alert（ 此次请求无法完成。请稍后再试。）; 
} 
} 
 其他 {
 alert（'' 请求有问题。'）; 
} 
} 
} 
 
 makeRequest（'  http://dev.livestuff.com/.LoginAsJSON？' +查询）; 
 
} 
 < /   script  >  

控件不在if内（httpRequeset.Response）条件，当我通过警报打印它时，它显示未定义的警报。这可能是跨领域的问题，但我不能正确理解。所以我必须为此做些什么我必须改变。





谢谢。

解决方案

Hello, I have design a window form application, in which I call a jQuery. The script is following

<script type="text/javascript">
        var email;
        var pwd;
        function loginuser(email, pwd) {

            var query = 'aUserName=' + email + '&aPassword=' + pwd;

            function makeRequest(url) {

                if (window.XMLHttpRequest) {

                    httpRequest = new XMLHttpRequest();

                }
                else if (window.ActiveXObject) {
                    try {

                        httpRequest = new ActiveXObject("Msxml2.XMLHTTP");
                    }
                    catch (e) {
                        try {
                            httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
                        }
                        catch (e) { }
                    }
                }

                if (!httpRequest) {

                    alert('Giving up :( Cannot create an XMLHTTP instance');
                    return false;
                }
                httpRequest.onreadystatechange = alertContents;

                httpRequest.open('GET', url);

                httpRequest.send();

            }




            function alertContents() {


                if (httpRequest.readyState === 4) {
                    if (httpRequest.status === 200) {
                        alert(httpRequest.status);
                        //httpRequest.open("GET", window.location.href, false);
                        //httpRequest.responseType = "document";
                        // httpRequest.send();

                        if (httpRequest.response) {
                           
                            var info = JSON.parse(httpRequest.response);

                            if (info.Error) {

                                alert("Request cannot be completed this time. Please try again later.");
                                loader("unlock");
                            }
                            else {
                                checkCookie();
                            }
                        } else {
                            console.log("ignoring null value");
                            alert("Request cannot be completed this time. Please try again later.");
                        }
                    }
                    else {
                        alert('There was a problem with the request.');
                    }
                }
            }

            makeRequest('http://dev.livestuff.com/.LoginAsJSON?' + query);

        }
    </script>

The control is not going inside the if(httpRequeset.Response) condition and when I print it through alert, it showing undefined alert. It may be the problem of cross domain but I am not understanding properly. So what I have to do for this where I have to change.


Thanks.

解决方案

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