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node.js - express+multer抛出错误:'app.use() requires middleware functions'

利用node,想要通过表单传递值,node的代码如下:

var express=require('express'),
    //form的get方法使用url模块
    url=require('url'),
    //form的post方法使用url模块
    bodyParser=require('body-parser'),
    multer=require('multer'),
    util=require('util'),
    app=express();

app.use(multer({dest:'./'}));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended:true}));

app.get('/',function(req,res){
    res.sendfile('./index.html');
});

app.post('/reg',function(req,res){//页面是post,服务器端也是要post
    var urlObj=url.parse(req.url,true);
    res.write(util.inspect(req.files));
    res.end(JSON.stringify(req.body));
});

app.listen(8080);

目前express版本是4.13.3,multer的版本是1.0.1

运行抛出的错误如下:

throw new TypeError('app.use() requires middleware functions');

在stackoverflow上查找到类似的问题,但是他的原因是所使用的包的问题stackoverflow问题。
我查看了multer的文档,好像它并没有做出类似的改变。特意向大家请教这个问题

ringa_leeringa_lee2764 days ago1298

reply all(4)I'll reply

  • 怪我咯

    怪我咯2017-04-17 13:01:06

    This problem has been solved. It is a problem with the multer version. Multer requires version 0.1.8.

    npm install multer@0.1.8 

    reply
    0
  • 迷茫

    迷茫2017-04-17 13:01:06

    I have now upgraded multer 1.1.0 and encountered the same problem, so I went to his official website to find out more.

    You can no longer write like this

    app.use(multer({dest:'./'}));

    You need to write it in the route

    var multer = require('multer');
    
    var upload = multer({dest: './public/images/user'});
    
    router.post('/upload', upload.fields([
        {name: 'file1'},
        {name: 'file2'},
        {name: 'file3'},
        {name: 'file4'},
        {name: 'file5'}
    ]), function(req, res, next){
        for(var i in req.files){
            console.log(req.files[i]);
        }
        req.flash('success', '文件上传成功!');
        res.redirect('/upload');
    });

    The above example is that I submitted 5 names at the same time.
    It provides 3 methods. single() .array() .fields()
    .single() is a file
    For example

    upload.single('avatar')//avatar是name名

    .array() is multiple files with the same name
    such as

    upload.array('photos', 12)//photos是name名,第二个参数是最大12个为name名的文件

    .fields() is multiple files
    such as

    upload.fields([{ name: 'avatar', maxCount: 1 }, { name: 'gallery', maxCount: 8 }])
    //maxCount是可选

    Hope to help future nodejs learners

    reply
    0
  • 阿神

    阿神2017-04-17 13:01:06

    I also encountered this problem, have you solved it?

    reply
    0
  • PHP中文网

    PHP中文网2017-04-17 13:01:06

    I also encountered this problem today, and I studied it by the way today. If you want to use the v1.1.0 version, you can refer to my code

    // 文件上传插件
    var multer = require('multer');
    var storage = multer.diskStorage({
      destination: function (req, file, cb) {
        cb(null, './public/images/user')
      },
      filename: function (req, file, cb) {
        cb(null, file.originalname)
      }
    });
    var upload = multer({ storage: storage });
    var cpUpload = upload.any();
    app.use(cpUpload);

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