Use ionic and express.js to upload files

clientController.js

app.controller(['$cordovaFileTransfer', function ( $cordovaFileTransfer ) {
    // 一定要将代码放在事件监听中
    // 表示设备准备好了之后才能执行里面的代码
    document.addEventListener('deviceready', function () {
        var uploadOptions = new FileUploadOptions(),
            server = 'your_server_api',
            imgPath = 'your_img_path';

        // 注意此处设置的fileKey，Express服务端中也需要这个
        uploadOptions.fileKey = 'file';
        uploadOptions.fileName = imgPath.substr(imgPath.lastIndexOf('/') + 1);
        uploadOptions.mimeType = 'image/jpeg';
        uploadOptions.chunkedMode = false;

        $cordovaFileTransfer.upload( server, imgPath, uploadOptions )
            .then(function ( result ) {
                // 上传成功
            }, function ( error ) {
                // 上传失败
            }, function ( progress ) {
                // 上传进度
            });

    }, false);
}]);

server_router.js

var router = require('express').Router(),
    uploadPhoto = require('/modules/path/server_upload').uploadFile;

router.all('/photo_upload', function ( req, res ) {
    uploadFile(req, res);
});

server_upload.js

var multer = require('multer'),
    storage = multer.diskStorage({
        destination: function ( req, file, callback ) {
            // 注意，此处的uploads目录是从项目的根目录开始寻找
            // 如果没有的话，需要手动新建此文件夹
            callback(null, './uploads');
        },
        
        // multer不会自动添加文件后缀名，需要手动添加
        filename: function ( req, file, callback ) {
            callback(null, file.fieldname + '-' + Date.now() + '.' + file.mimetype.split('/')[1]);
        }
    }),

    // single里的字符串必须设置为与客户端设置的fileKey一致
    upload = multer({
        storage: storage,
        limits: 1000000
    }).single('file');

// upload photo
function uploadFile( req, res ) {
    upload(req, res, function ( error ) {
        if ( error ) {
            console.error(JSON.stringify(error));
            return res.end('Error uploading file.');
        }
        console.log('Success!');
        res.end('File is uploaded');
    });
}

exports.uploadFile = uploadFile;