Nodejs in Action req.files undefined

在第八章上传图片的例子中，在photo\routes\photos.js:28:24 出现“Cannot read property 'photo' of undefined”的错误，上网查原因，发现是少了multipart()中间件，参考了一下http://stackoverflow.com/questions/23114374/file-uploading-with-express-4-0-req-files-undefined的回答，在https://github.com/andrewrk/connect-multiparty中找到了答案：

var multipart = require('connect-multiparty');var multipartMiddleware = multipart();app.post('/upload', multipartMiddleware, function(req, resp) {  console.log(req.body, req.files);  // don't forget to delete all req.files when done});