使用AJAX请求从另一个域获取图像数据

问题描述

我正在尝试通过 AJAX请求从另一个域中获取图像的二进制数据.我尝试了各种方法，但是没有可行的解决方案.我在互联网上发现了一些看起来不错的代码，但是即使调用此命令，我仍然会出错.

I am trying to get binary data of an image from another domain with an AJAX request. I tried various methods, but there was no working solution. I found some code on the internet that looked good, but even with this calls I get errors.

我怎么了?有标准化的方法可以做到这一点吗?

What do I wrong? Is there a standardized way to do this?

这是我到目前为止尝试过的内容:

Here is what I tried until now:

var request = this.createCORSRequest('GET', 'http://url/to/image.png');
request.onload = function () {
    var text = request.response;
};
request.onerror = function (error) {
    alert('Woops, there was an error making the request.');
};

request.send();

private createCORSRequest(method, url) {
        var xhr: XMLHttpRequest = new XMLHttpRequest();
        if ("withCredentials" in xhr) {

        // Check if the XMLHttpRequest object has a "withCredentials" property.
        // "withCredentials" only exists on XMLHTTPRequest2 objects.
        xhr.open(method, url, true);

        } else if (typeof XDomainRequest != "undefined") {

            // Otherwise, check if XDomainRequest.
            // XDomainRequest only exists in IE, and is IE's way of making CORS requests.
            var xdhr = new XDomainRequest();
            xdhr.open(method, url);

        } else {

            // Otherwise, CORS is not supported by the browser.
            xhr = null;

        }
        return xhr;
}

我什至在stackoverflow上找到了没有ajax的解决方案，但是它对我不起作用:

I even found this solution without ajax here on stackoverflow, but it does not work for me:

使用jQuery异步加载图像

以下是错误事件包含的属性的屏幕:

Here a screen of the properties the error event contains:

我的目标是从我从原子供稿中获得的url获取图像的二进制文件.我需要二进制文件才能将图片复制到MS SharePoint.

My goal is to get the binary of an image from a url which I get from an atom feed . I need the binaries to copy the picture to MS SharePoint.

推荐答案

除非以下条件，否则您无法从其他域获取数据:

You cannot get data from another domain unless :

• 远程服务器允许它使用CORS
• 您以不安全的模式运行浏览器.

原因:否则，站点A可能(恶意)从站点B读取用户数据

Reason : otherwise site A would be able to (maliciously) read the user data from site B

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