Express3-4迁移问题

以下命令需要删除才正常执行，不知

var multer = require('multer');
app.use(multer());

以下已废弃，4.0有新的route加入

app.use(app.router);

中间件需要自行加载引入

var express = require('express');
var path = require('path');
var http = require('http');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var methodOverride = require('method-override');
var partials = require('express-partials');
// var multer = require('multer');
var errorHandler = require('errorhandler');
var routes = require('./routes');