使用ajax下载二进制文件的支持不是很好，还是under development as working drafts。
简单下载方法：
你可以通过下面的代码让浏览器下载请求的文件，所有浏览器都支持这个，显然会触发WebApi请求。
$scope.downloadFile = function(downloadPath) {
window.open(downloadPath, '_blank', '');
}
Ajax二进制下载方式：
在某些浏览器中可以使用 ajax 下载二进制文件，以下是适用于最新版本的 Chrome、Internet Explorer、FireFox 和 Safari 的实现。
它使用 arraybuffer 响应类型，然后将其转换为 JavaScript blob，然后使用 saveBlob 方法呈现以保存 - 尽管目前仅存在于 Internet Explorer 中 - 或转换为由浏览器打开的 blob 数据 URL，如果支持在浏览器中查看 mime 类型，则会触发下载对话框。
Internet Explorer 11 支持（固定）
注意：Internet Explorer 11 不喜欢使用 msSaveBlob 函数，如果它已被别名 - 也许是一个安全功能，但更可能是一个缺陷，因此使用 var saveBlob = navigator.msSaveBlob || navigator.webkitSaveBlob ... etc. 来确定可用的 saveBlob 支持导致异常；因此为什么下面的代码现在单独测试navigator.msSaveBlob。谢谢？微软
// Based on an implementation here: web.student.tuwien.ac.at/~e0427417/jsdownload.html
$scope.downloadFile = function(httpPath) {
// Use an arraybuffer
$http.get(httpPath, { responseType: 'arraybuffer' })
.success( function(data, status, headers) {
var octetStreamMime = 'application/octet-stream';
var success = false;
// Get the headers
headers = headers();
// Get the filename from the x-filename header or default to "download.bin"
var filename = headers['x-filename'] || 'download.bin';
// Determine the content type from the header or default to "application/octet-stream"
var contentType = headers['content-type'] || octetStreamMime;
try
{
// Try using msSaveBlob if supported
console.log("Trying saveBlob method ...");
var blob = new Blob([data], { type: contentType });
if(navigator.msSaveBlob)
navigator.msSaveBlob(blob, filename);
else {
// Try using other saveBlob implementations, if available
var saveBlob = navigator.webkitSaveBlob || navigator.mozSaveBlob || navigator.saveBlob;
if(saveBlob === undefined) throw "Not supported";
saveBlob(blob, filename);
}
console.log("saveBlob succeeded");
success = true;
} catch(ex)
{
console.log("saveBlob method failed with the following exception:");
console.log(ex);
}
if(!success)
{
// Get the blob url creator
var urlCreator = window.URL || window.webkitURL || window.mozURL || window.msURL;
if(urlCreator)
{
// Try to use a download link
var link = document.createElement('a');
if('download' in link)
{
// Try to simulate a click
try
{
// Prepare a blob URL
console.log("Trying download link method with simulated click ...");
var blob = new Blob([data], { type: contentType });
var url = urlCreator.createObjectURL(blob);
link.setAttribute('href', url);
// Set the download attribute (Supported in Chrome 14+ / Firefox 20+)
link.setAttribute("download", filename);
// Simulate clicking the download link
var event = document.createEvent('MouseEvents');
event.initMouseEvent('click', true, true, window, 1, 0, 0, 0, 0, false, false, false, false, 0, null);
link.dispatchEvent(event);
console.log("Download link method with simulated click succeeded");
success = true;
} catch(ex) {
console.log("Download link method with simulated click failed with the following exception:");
console.log(ex);
}
}
if(!success)
{
// Fallback to window.location method
try
{
// Prepare a blob URL
// Use application/octet-stream when using window.location to force download
console.log("Trying download link method with window.location ...");
var blob = new Blob([data], { type: octetStreamMime });
var url = urlCreator.createObjectURL(blob);
window.location = url;
console.log("Download link method with window.location succeeded");
success = true;
} catch(ex) {
console.log("Download link method with window.location failed with the following exception:");
console.log(ex);
}
}
}
}
if(!success)
{
// Fallback to window.open method
console.log("No methods worked for saving the arraybuffer, using last resort window.open");
window.open(httpPath, '_blank', '');
}
})
.error(function(data, status) {
console.log("Request failed with status: " + status);
// Optionally write the error out to scope
$scope.errorDetails = "Request failed with status: " + status;
});
};
用法：
var downloadPath = "/files/instructions.pdf";
$scope.downloadFile(downloadPath);
注意事项：
您应该修改您的 WebApi 方法以返回以下标头：
我希望这会有所帮助。