javascript - Express JS Node JS multer 集成问题

Question

https://github.com/cminhho/AngularFileUpload-Express/blob/master/server.js

我正在实现本教程并相应地做了一些事情，但是当我使用更新的 express js 时，它会在 express js 端引发错误。

错误

    C:\nodefiles\new\node_modules\express\lib\application.js:209
throw new TypeError('app.use() requires middleware functions');
      ^
TypeError: app.use() requires middleware functions
    at EventEmitter.use (C:\nodefiles\new\node_modules\express\lib\application.js:209:11)
    at Object.<anonymous> (C:\nodefiles\new\server.js:9:5)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:501:10)
    at startup (node.js:129:16)
    at node.js:814:3

这是抛出错误的代码

    app.use(express.static(__dirname + '/public')); 
app.use(multer({ dest: './uploads/',
 rename: function (fieldname, filename) {
    return filename+Date.now();
  },
onFileUploadStart: function (file) {
  console.log(file.originalname + ' is starting ...')
},
onFileUploadComplete: function (file) {
  console.log(file.fieldname + ' uploaded to  ' + file.path)
  done=true;
}
}));

这可能是因为 Express JS 更新版本请告诉我我应该在服务器端更改什么才能使它工作。

您也可以从 github 存储库中获取所有前端代码。

Answer 1

multer 改变了 api。您遵循的教程已过时。您当然可以使用旧版本的 multer，但存在一些问题。在 github multer 页面中有正确的上传文件使用方法:https://github.com/expressjs/multer来自多个页面:

var express = require('express')
var multer  = require('multer')
var upload = multer({ dest: 'uploads/' })

var app = express()

app.post('/profile', upload.single('avatar'), function (req, res, next) {
  // req.file is the `avatar` file
  // req.body will hold the text fields, if there were any
})

app.post('/photos/upload', upload.array('photos', 12), function (req, res, next) {
  // req.files is array of `photos` files
  // req.body will contain the text fields, if there were any
})