我可能失去了一些东西简单，但我将如何在JavaScript中创建一个File对象给出从AJAX请求接受？二进制数据。

  $。阿贾克斯（{
  网址：http://example.com/image.jpg
  成功：功能（数据）{
    //转换二进制数据文件对象
  }
}）;
 

解决方案

我终于想通了这一点。为了避免跨站点脚本问题，我创造了我的服务器上代理端点。然后，我可以通过图片的URL到我的服务器，然后执行远程文件上的GET请求，将响应转换为Base64，并将其发送回浏览器。那么浏览器可以将数据转换为二进制和创建BLOB（这是一样好，我的目的文件）。

  $。阿贾克斯（{
  网址：apiRoot +/代理，
  数据：{URL：http://example.com/image.jpg}，
  成功：功能（数据）{
    变种二进制= ATOB（data.split（，）[1]）;
    变种阵列= [];
    对于（VAR I = 0; I＆LT; binary.length;我++）{
      array.push（binary.char $ C $猫（一））;
    }
    var文件=新的斑点（[新Uint8Array（阵列），{类型：为image / jpeg'}）;
  }
}）;
 

I'm probably missing something simple here, but how would I create a File object in JavaScript given the binary data as received from an AJAX request?

$.ajax({
  url: "http://example.com/image.jpg",
  success: function(data) {
    // Convert binary data to File object
  }
});

I finally figured this out. In order to avoid cross-site scripting issues, I created a proxy endpoint on my server. Then I can pass the image URL to my server, which then executes a GET request on the remote file, converts the response to Base64, and sends it back to the browser. The browser can then convert the data back to binary and create a Blob (which is as good as a File for my purposes).

$.ajax({
  url: apiRoot + "/proxy",
  data: {url: "http://example.com/image.jpg"},
  success: function(data) {
    var binary = atob(data.split(',')[1]);
    var array = [];
    for (var i = 0; i < binary.length; i++) {
      array.push(binary.charCodeAt(i));
    }
    var file = new Blob([new Uint8Array(array)], {type: 'image/jpeg'});
  }
});