如何在节点js中下载服务器文件?

你能告诉我如何在节点js中下载服务器文件吗

节点js代码(请求代码)

var express = require('express');
var multer = require('multer');
var bodyParser = require('body-parser');
var cors = require('cors');
var app = express();
var path = require('path');
var PORT = process.env.PORT || 3000;


// use of body parser
app.use(bodyParser.urlencoded({
    extended: true
}));

app.use(bodyParser.json());
app.use(cors());



app.get('/download', function(req, res){
    console.log(__dirname);
    var file = path.join(__dirname , '/uploads/file-1534458777206.xlsx');
    console.log(file)
    res.download(file); // Set disposition and send it.
});




app.listen(PORT, () => {
    console.log(`App is listening to ${PORT}`);
})

在客户机上

$('.download').on('click', function () {
            $.ajax({
                url: 'http://localhost:3000/download',
                type: 'GET',
                dataType: 'json',
                success: function (data) {
                    console.log('data')
                },
                error: function (jqXHR, textStatus, errorThrown) {
                    // Handle errors here
                    console.log('ERRORS: ' + textStatus);
                    // STOP LOADING SPINNER
                }
            });

在控制台上

ERRORS: parsererror
3index.html?_ijt=9lu9erpan2oq6qf28851ngj0ra:32 ERRORS: parsererror
2index.html?_ijt=9lu9erpan2oq6qf28851ngj0ra:32 ERRORS: parsererror

C:\Users\B0207296\WebstormProjects\uploadFile\server
C:\Users\B0207296\WebstormProjects\uploadFile\server\uploads\file-1534458777206.xlsx

为什么文件没有下载到客户机上,正如我提到的,文件出现在上面的url中