我一直在尝试使用blobs的另一种选择。我已经设法让它下载文本文档，我下载了PDF文件(但他们是损坏的)。

使用blob API，你可以做以下事情:

$.post(/*...*/,function (result)
{
    var blob=new Blob([result]);
    var link=document.createElement('a');
    link.href=window.URL.createObjectURL(blob);
    link.download="myFileName.txt";
    link.click();

});

这是IE 10+， Chrome 8+， FF 4+。参见https://developer.mozilla.org/en-US/docs/Web/API/URL.createObjectURL

它只能在Chrome、Firefox和Opera中下载文件。它使用锚标记上的下载属性强制浏览器下载它。

我想我已经接近了，但是有些东西正在破坏文件(图像)，无论如何，也许有人可以揭示这种方法的问题

$.ajax({
            url: '/GenerateImageFile',
            type: 'POST',
            cache: false,
            data: obj,
            dataType: "text",
            success: function (data, status, xhr) {
                let blob = new Blob([data], { type: "image/jpeg" });

                let a = document.createElement('a');
                a.href = window.URL.createObjectURL(blob);
                a.download = "test.jpg";
                document.body.appendChild(a);
                a.click();
                document.body.removeChild(a);
                window.URL.removeObjectURL(a.href);
            },
            complete: function () {

            },
            beforeSend: function () {

            }
        });

这个问题被问到已经有一段时间了，但我也有同样的挑战，想要分享我的解决方案。它使用了其他答案中的元素，但我无法找到它的全部。它不使用表单或iframe，但它需要post/get请求对。它不是在请求之间保存文件，而是保存post数据。这似乎既简单又有效。

客户端

var apples = new Array(); 
// construct data - replace with your own
$.ajax({
   type: "POST",
   url: '/Home/Download',
   data: JSON.stringify(apples),
   contentType: "application/json",
   dataType: "text",

   success: function (data) {
      var url = '/Home/Download?id=' + data;
      window.location = url;
   });
});

服务器

[HttpPost]
// called first
public ActionResult Download(Apple[] apples)
{
   string json = new JavaScriptSerializer().Serialize(apples);
   string id = Guid.NewGuid().ToString();
   string path = Server.MapPath(string.Format("~/temp/{0}.json", id));
   System.IO.File.WriteAllText(path, json);

   return Content(id);
}

// called next
public ActionResult Download(string id)
{
   string path = Server.MapPath(string.Format("~/temp/{0}.json", id));
   string json = System.IO.File.ReadAllText(path);
   System.IO.File.Delete(path);
   Apple[] apples = new JavaScriptSerializer().Deserialize<Apple[]>(json);

   // work with apples to build your file in memory
   byte[] file = createPdf(apples); 

   Response.AddHeader("Content-Disposition", "attachment; filename=juicy.pdf");
   return File(file, "application/pdf");
}

Another approach instead of saving the file on the server and retrieving it, is to use .NET 4.0+ ObjectCache with a short expiration until the second Action (at which time it can be definitively dumped). The reason that I want to use JQuery Ajax to do the call, is that it is asynchronous. Building my dynamic PDF file takes quite a bit of time, and I display a busy spinner dialog during that time (it also allows other work to be done). The approach of using the data returned in the "success:" to create a Blob does not work reliably. It depends on the content of the PDF file. It is easily corrupted by data in the response, if it is not completely textual which is all that Ajax can handle.

我已经醒了两天了，现在试图弄清楚如何使用jquery和ajax调用下载文件。我得到的所有支持都无法帮助我，直到我尝试了这个。

客户端

function exportStaffCSV(t) { var postData = { checkOne: t }; $.ajax({ type: "POST", url: "/Admin/Staff/exportStaffAsCSV", data: postData, success: function (data) { SuccessMessage("file download will start in few second.."); var url = '/Admin/Staff/DownloadCSV?data=' + data; window.location = url; }, traditional: true, error: function (xhr, status, p3, p4) { var err = "Error " + " " + status + " " + p3 + " " + p4; if (xhr.responseText && xhr.responseText[0] == "{") err = JSON.parse(xhr.responseText).Message; ErrorMessage(err); } }); }

服务器端

 [HttpPost]
    public string exportStaffAsCSV(IEnumerable<string> checkOne)
    {
        StringWriter sw = new StringWriter();
        try
        {
            var data = _db.staffInfoes.Where(t => checkOne.Contains(t.staffID)).ToList();
            sw.WriteLine("\"First Name\",\"Last Name\",\"Other Name\",\"Phone Number\",\"Email Address\",\"Contact Address\",\"Date of Joining\"");
            foreach (var item in data)
            {
                sw.WriteLine(string.Format("\"{0}\",\"{1}\",\"{2}\",\"{3}\",\"{4}\",\"{5}\",\"{6}\"",
                    item.firstName,
                    item.lastName,
                    item.otherName,
                    item.phone,
                    item.email,
                    item.contact_Address,
                    item.doj
                    ));
            }
        }
        catch (Exception e)
        {

        }
        return sw.ToString();

    }

    //On ajax success request, it will be redirected to this method as a Get verb request with the returned date(string)
    public FileContentResult DownloadCSV(string data)
    {
        return File(new System.Text.UTF8Encoding().GetBytes(data), System.Net.Mime.MediaTypeNames.Application.Octet, filename);
        //this method will now return the file for download or open.
    }

祝你好运。

我认为最好的方法是结合使用。您的第二种方法似乎是一个优雅的解决方案，其中涉及到浏览器。

这取决于调用的方式。(无论是浏览器还是web服务调用)您可以使用两者的组合，将URL发送到浏览器并将原始数据发送到任何其他web服务客户端。