IE中的XMLHttpRequest和setRequestHeader返回错误 [英] XMLHttpRequest and setRequestHeader in IE returns an error

问题描述

我尝试进行跨网域POST请求并返回JSON编码的响应，

一切正常，除了IE 7,8,9。
I尝试这些解决方案，但我得到这个错误：

对象不支持属性或方法'setRequestHeader'

函数createXMLHTTPObject（） - 尝试1

  function createXMLHTTPObject（）{
 var xmlhttp = false; 
 var is_IE = window.XDomainRequest？真假; 
 if（is_IE）{
 xmlhttp = new window.XDomainRequest（）; 
} else {
 if（window.XMLHttpRequest）{
 xmlhttp = new XMLHttpRequest（）; 
} else {
 xmlhttp = new ActiveXObject（Microsoft.XMLHTTP）; 
} 
} 
 return xmlhttp;函数createXMLHTTPObject（） - 尝试2      p> 
 
 
  var XMLHttpFactories = [
 function（）{return new XMLHttpRequest（）}，
 function新的ActiveXObject（Msxml2.XMLHTTP）}，
 function（）{return new ActiveXObject（Msxml3.XMLHTTP）}，
 function（）{return new ActiveXObject（Microsoft.XMLHTTP）} 
]; 
 
 function createXMLHTTPObject（）{
 var xmlhttp = false; 
 for（var i = 0; i< XMLHttpFactories.length; i ++）{
 try {
 xmlhttp = XMLHttpFactories [i]（）; 
} 
 catch（e）{
 continue; 
} 
 break; 
} 
 return xmlhttp; 
} 
  
 函数send（） 
 
这里它返回错误，在 req.setRequestHeader（'User-Agent'，'XMLHTTP / 1.0'）;  
 函数send（postData，callback）{
 var url ='http://domain.com/ajax-processing.php'; // url overlap 
 var req = createXMLHTTPObject（）; 
 if（！req）return; 
 var method =（postData）？ POST：GET; 
 req.open（method，url，true）; 
 req.setRequestHeader（'User-Agent'，'XMLHTTP / 1.0'）; 
 if（postData）{
 req.setRequestHeader（'Content-type'，'application / x-www-form-urlencoded'）; 
} 
 req.onreadystatechange = function（）{
 if（req.readyState！= 4）return; 
 if（req.status！= 200& req.status！= 304）{
 console.log（'HTTP error'+ req.status）; 
 return; 
} 
 callback（req）; 
} 
 if（req.readyState == 4）return; 
 req.send（postData）; 
} 
  
 这里我调用send函数 > 
 
 
  var insert ='id = 1& type = insert'; 
 CLib.send（insert，function（data）{
 console.log（data）; 
}）; 
  
可以在IE中建立跨网域要求吗？
 
 
解决方案
感谢很多@Esailija谁通知我，我可以' 
 
 
 
所以我尝试了其他的方法和解决方案，我终于回来了一个更简单的方法：
 
 changed POST请求GET和一切工作正常后一些小的更改。
 
I try to make Cross Domain POST requests and get back JSON encoded responses,

everything works fine except in IE 7, 8, 9.
I have try those solutions but i get this error:

  
Object doesn't support property or method 'setRequestHeader'
Function createXMLHTTPObject() - attempt 1
function createXMLHTTPObject() {
    var xmlhttp = false;
        var is_IE = window.XDomainRequest ? true : false;
        if (is_IE) {
            xmlhttp = new window.XDomainRequest();
        } else {
            if (window.XMLHttpRequest) {
                xmlhttp = new XMLHttpRequest();
            } else {
                xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
            }
        }
    return xmlhttp;
}
Function createXMLHTTPObject() - attempt 2
var XMLHttpFactories = [
    function() { return new XMLHttpRequest() },
    function() { return new ActiveXObject("Msxml2.XMLHTTP") },
    function() { return new ActiveXObject("Msxml3.XMLHTTP") },
    function() { return new ActiveXObject("Microsoft.XMLHTTP") }
];

function createXMLHTTPObject() {
    var xmlhttp = false;
    for (var i=0; i<XMLHttpFactories.length; i++) {
        try {
            xmlhttp = XMLHttpFactories[i]();
        }
        catch(e) {
            continue;
        }
        break;
    }
    return xmlhttp; 
}
Function send()

Here it returns the error, at: req.setRequestHeader('User-Agent', 'XMLHTTP/1.0');
function send(postData, callback) {
    var url = 'http://domain.com/ajax-processing.php'; //url overlap
    var req = createXMLHTTPObject();
    if (!req) return;
    var method = (postData) ? "POST" : "GET";
    req.open(method, url, true);
    req.setRequestHeader('User-Agent', 'XMLHTTP/1.0');
    if (postData) {
        req.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
    }
    req.onreadystatechange = function() {
        if (req.readyState != 4) return;
        if (req.status != 200 && req.status != 304) {
            console.log('HTTP error ' + req.status);
            return;
        }
        callback(req);
    }
    if (req.readyState == 4) return;
    req.send(postData); 
}
Here i call the send function  
var insert = 'id=1&type=insert';
CLib.send(insert, function(data) {
    console.log(data);
});
Is it possible to make Cross Domain requests in IE?

How i can leave behind this part, without using any other library like jQuery?
解决方案
Thanks a lot @Esailija who inform me that i can't make set request headers with the XDomainRequest.

So i tried other methods and solutions also and i finally came back with a simpler method:

changed the POST requests to GET and everything working fine after some small changes.

                        
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