app.js

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var fs = require('fs');
var cors = require('cors');

// 连接本地数据库 mongodb://<db_user>:<db_password>@<hostname>:<port>/<dbname>
var mongodb = require('./config/mongoose')();

// models required ，路由要放在models required之后，否则会报Schema hasn‘t been registered for model “User”.
// 放到session后面，否则connect-mogond错
var models_path = __dirname + '/app/models';
var walk = function(path){
  fs
      .readdirSync(path) // 同步读取
      .forEach(function(file) {
        var newPath = path + '/' +file;
        var stat = fs.statSync(newPath);

        if(stat.isFile()){
          if(/(.*)\.(js|coffee)/.test(file)){
            require(newPath)
          }
        }

        else if (stat.isDirectory()) {
          walk(newPath);
        }

      })
};
walk(models_path);

// 路由
var routes = require('./routes/routes');

// 实例化Express.js 对象
var app = express();

// http发生了413错误码，请求实体过大
app.use(bodyParser.json({ "limit":"10000kb"}));

// 设置跨域访问
app.use(cors());

// view engine setup，设置相关配置——视图模板的绝对路径以及模板文件的扩展
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev')); // 在终端中不停地对每个请求输出日志
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(require('node-sass-middleware')({
  src: path.join(__dirname, 'public'),
  dest: path.join(__dirname, 'public'),
  indentedSyntax: true,
  sourceMap: true
}));
app.use(express.static(path.join(__dirname, 'public')));

// 定义路由
app.use('/', routes);
//app.use('/users', users);     // 如果/routes/users.js这个文件有/test的get请求，则访问接口为localhost:3000/users/test

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
  app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
      message: err.message,
      error: err
    });
  });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
  res.status(err.status || 500);
  res.render('error', {
    message: err.message,
    error: {}
  });
});


module.exports = app;