适应AJAX的跨域 [英] Adapt ajax for crossdomain

问题描述

是跨域以及如何

有可能适应这种code

 函数makeRequest（URL）{

    VAR HTTP_REQUEST = FALSE;

    如果（window.XMLHtt prequest）{// Mozilla中，Safari浏览器，...
        HTTP_REQUEST =新XMLHtt prequest（）;
        如果（http_request.overrideMimeType）{
                http_request.overrideMimeType（为text / xml'）;
        }
    }否则，如果（window.ActiveXObject）{// IE
        尝试 {
            HTTP_REQUEST =新的ActiveXObject（MSXML2.XMLHTTP）;
        }赶上（五）{
            尝试 {
            HTTP_REQUEST =新的ActiveXObject（Microsoft.XMLHTTP）;
            }赶上（五）{}
        }
    }

    如果（！HTTP_REQUEST）{
        警报（无法创建一个XMLHTTP实例）;
        返回false;
    }

    http_request.onreadystatechange =功能（）{alertContents（HTTP_REQUEST）; };
    http_request.open（GET，URL，真正的）;
    http_request.send（空）;
}

功能alertContents（HTTP_REQUEST）{
    如果（http_request.readyState == 4）{
        如果（http_request.status == 200）{
            receiveData（http_request.responseText）;
        } 其他 {
            警报（Îòâåòñåðâåðàïîëó÷AI，II阿努îøèáêà）;
        }
    }
}
 

解决方案

在同源策略 prevents的JavaScript在正常情况下，不同来源读取数据。

您可以解决用：

1. 有关网页的来源数据代理
2. JSONP
3. CORS （的有限的浏览器支持，但可能为黄金时间，现在不够好）

Is it possible adapt this code for crossdomain and how

function makeRequest(url) {

    var http_request = false;

    if (window.XMLHttpRequest) { // Mozilla, Safari,...
        http_request = new XMLHttpRequest();
        if (http_request.overrideMimeType) {
                http_request.overrideMimeType('text/xml');
        }
    } else if (window.ActiveXObject) { // IE
        try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try {
            http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
        }
    }

    if (!http_request) {
        alert('Cannot create an XMLHTTP instance');
        return false;
    }

    http_request.onreadystatechange = function() { alertContents(http_request); };
    http_request.open('GET', url, true);
    http_request.send(null);
}

function alertContents(http_request) {
    if (http_request.readyState == 4) {
        if (http_request.status == 200) {
            receiveData(http_request.responseText);
        } else {
            alert("Îòâåò ñåðâåðà ïîëó÷åí, íî åñòü îøèáêà");
        }         
    } 
}

解决方案

The same origin policy prevents JavaScript reading data from different origins under normal circumstances.

You can work around with:

1. A proxy for the data on the page's origin
2. JSONP
3. CORS (limited browser support, but possibly good enough for prime time now)

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