nodejs上传文件multer

var multer  = require('multer')

var storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, 'upload/');
  },
  filename: function (req, file, cb) {
    cb(null, 'member_' + new Date().getTime() + '.' + file.mimetype.substring(file.mimetype.lastIndexOf('/') + 1));
  }
})
var upload = multer({ storage: storage })

app.use('/upload', express.static('upload'))
app.use('/upload', uploadRouter);
app.post('/profile', upload.single('thumbnail'), function(req, res, next) {
  res.json(req.file)
});