KARTHIKEYAN.AThiago Miranda de Oliveira提出了一个问题：Download a file from NodeJS Server using Express，或许与您遇到的问题类似。

Update

Express has a helper for this to make life easier.

app.get('/download', function(req, res){

var file = __dirname + '/upload-folder/dramaticpenguin.MOV';

res.download(file); // Set disposition and send it.

});

Old Answer

As far as your browser is concerned, the file's name is just 'download', so you need to give it more info by using another HTTP header.

res.setHeader('Content-disposition', 'attachment; filename=dramaticpenguin.MOV');

You may also want to send a mime-type such as this:

res.setHeader('Content-type', 'video/quicktime');

If you want something more in-depth, here ya go.

var path = require('path');

var mime = require('mime');

var fs = require('fs');

app.get('/download', function(req, res){

var file = __dirname + '/upload-folder/dramaticpenguin.MOV';

var filename = path.basename(file);

var mimetype = mime.lookup(file);

res.setHeader('Content-disposition', 'attachment; filename=' + filename);

res.setHeader('Content-type', mimetype);

var filestream = fs.createReadStream(file);

filestream.pipe(res);

});

You can set the header value to whatever you like. In this case, I am using a mime-type library - node-mime, to check what the mime-type of the file is.

Another important thing to note here is that I have changed your code to use a readStream. This is a much better way to do things because using any method with 'Sync' in the name is frowned upon because node is meant to be asynchronous.

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