node.js实现上传文件功能

var express=require('express')
var app=express()
var multer=require('multer')
var fs=require('fs')
// var upload=multer({ dest: './tmp/' })

var createFolder = function(folder){
 try{
  fs.accessSync(folder); 
 }catch(e){
  fs.mkdirSync(folder);
 } 
};

var uploadFolder = './upload/';

createFolder(uploadFolder);

// 通过 filename 属性定制
var storage = multer.diskStorage({
 destination: function (req, file, cb) {
  cb(null, uploadFolder); // 保存的路径，备注：需要自己创建
 },
 filename: function (req, file, cb) {
  // 将保存文件名设置为 字段名 + 时间戳，比如 logo-1478521468943
  let suffix=file.mimetype.split('/')[1];//获取文件格式
  cb(null, file.fieldname + '-' + Date.now()+'.'+suffix); 
 }
});

// 通过 storage 选项来对 上传行为 进行定制化
var upload = multer({ storage: storage })

app.post('/profile',upload.single('file'),function(req,res,next){
//req.body contains the text fields
 console.log(req.file,'------',req.body,'-------',req.file.path);
 // res.end(req.file.buffer);
 // console.log(req.file.buffer.toString().length);
 
 res.end('ok');
})
app.listen(8081);