对使用 ajax 下载二进制文件的支持不是很好，它作为工作草案仍在开发中。
简单的下载方法：
您只需使用下面的代码即可让浏览器下载请求的文件，并且所有浏览器都支持这种方式，并且显然会以相同的方式触发 WebApi 请求。
$scope.downloadFile = function(downloadPath) {
window.open(downloadPath, '_blank', '');
}
Ajax二进制下载方法：
可以在某些浏览器中使用 ajax 下载二进制文件，下面是一个适用于最新版本的 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，然后使用该saveBlob方法呈现以保存- 尽管目前仅在 Internet Explorer 中存在 - 或转换为由浏览器打开的 blob 数据 URL，触发下载对话框（如果支持在浏览器中查看 mime 类型）。
Internet Explorer 11 支持（已修复）
注意：Internet Explorer 11 不喜欢使用msSaveBlob别名的功能 - 可能是安全功能，但更可能是缺陷，因此var saveBlob = navigator.msSaveBlob || navigator.webkitSaveBlob ... etc.用于确定可用saveBlob支持导致异常；因此为什么下面的代码现在navigator.msSaveBlob单独测试。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);
笔记：
您应该修改 WebApi 方法以返回以下标头：
我希望这有帮助。