app.js

const path = require('path');

const Koa = require('koa'); // 类名一般要大写
const koaStatic = require('koa-static');
const koaBody = require('koa-body');
const error = require('koa-json-error');
const paramter = require('koa-parameter');
const mongoose = require('mongoose');

const routing = require('./app/routes');
const {connectionStr} = require('./app/config');

const app = new Koa(); // 实例化

mongoose.connect(connectionStr, {useNewUrlParser: true}, () => console.log('MongoDB 连接成功'));
mongoose.connection.on('error', console.error);


app.use(koaStatic(path.join(__dirname, '/app/public')));
// 生产环境 返回报错信息
app.use(error({
    postFormat: (e, {stack, ...rest}) =>
      process.env.NODE_ENV === 'production' ? rest : {stack, ...rest}
  }
));
app.use(koaBody({
  multipart: true, // 支持文件上传
  formidable: {
    uploadDir: path.join(__dirname, '/app/public/uploads'), // 设置上传目录
    keepExtensions: true  // 保留文件扩展名
  }
}));
app.use(paramter(app));
routing(app);


app.listen(3000, () => {
  console.log('running at 3000');
});