我尝试在Localy节点中要求一些JS文件-效果很好，但在Heroku中却遇到此错误-

错误：找不到模块“ ./routes.js”

我的代码看起来像：

'use strict';

var express = require('express');
var app = express();

app.set('port', (process.env.PORT || 5000));
app.use(express.static(__dirname + '/public'));

// Application Header
app.use(function(request, response, next) {
    response.header('Access-Control-Allow-Origin', '*');
    response.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE,OPTIONS');
    response.header('Access-Control-Allow-Headers', 'Content-Type, Authorization, Content-Length, X-Requested-With, X-PINGOTHER');

  next();
});

// views is directory for all template files
app.set('views', __dirname + '/views');
app.set('view engine', 'ejs');

  console.log('./routes.js');
require('./routes.js')(app);

app.listen(app.get('port'), function() {
  console.log('Node app is running on port', app.get('port'));
});

我究竟做错了什么？谢谢！