<form action="/getdata" method="post" enctype="multipart/form-data">...
</form>

$npm  install multer -save

var multer = require('multer');var upload = multer({dest:'uploads/'});app.use(multer({dest:"./uploads"}).array("file"));

<input type="file" id="exampleInputFile" name="file">

 var express = require('express');var router = express.Router();
    var multer = require('multer');var fs = require('fs');var path = require('path');var mysql = require('mysql')var upload = multer({ dest: 'uploads/' });

  router.post('/getdata',function(req,res){
//设置表单提交的路由地址，并且接收req/返回res给客户端的操作console.log(req.body);var name = req.body.name;var email = req.body.email;
//post传输方法要用bodyconsole.log(req.files);var load=path.join(__dirname,'..');console.log(load);var fname=req.files[0].filename;//获取上传文件的名字var oname=req.files[0].originalname;//获取上传文件的原始名字
//var load=path.join(__dirname,'..');返回上一层的地址这里用变量load接收了

 fs.readFile(load+'/uploads/'+fname,function(err,data){
//文件上传后默认是一堆字符串的名字并且没有后缀名称的未知格式文件，这里我们要用req.files查看原始文件的数据并且读取，待读取成功后进行下一步操作console.log(data);fs.writeFile('./public/uploads/'+oname,data,function(err,data){
//写入文件if(!err){        console.log('写入成功！')}else{console.log(err);}})})//链接数据库并且写入数据内容（选看）var connection = mysql.createConnection({host:'127.0.0.1',user:'root',password:'root',database:'web5'})connection.connect(function(err){if(err){console.log(err)}});connection.query('insert into porject(name,email,files)values(?,?,?)',[name,email,oname],function(err,data){if(!err){res.render('getdata',{title:'文件已保存至服务器'})}})connection.end();})