├── back-end
│ ├── logs 所有产生的日志文件存放在此目录下
│ ├── db.js 使用Sequelize连接数据库
│ ├── logger.js 日志的配置
│ ├── server.js 后端提供的所有接口

const path = require('path');
const log4js = require('koa-log4');

log4js.configure({
 appenders: {
  access: {
   type: 'dateFile',
   pattern: '-yyyy-MM-dd.log', //生成文件的规则
   filename: path.join('back-end/logs/', 'access.log') //生成文件名
  },
  application: {
   type: 'dateFile',
   pattern: '-yyyy-MM-dd.log',
   filename: path.join('back-end/logs/', 'application.log')
  },
  out: {
   type: 'console'
  }
 },
 categories: {
  default: { appenders: [ 'out' ], level: 'info' },
  access: { appenders: [ 'access' ], level: 'info' },
  application: { appenders: [ 'application' ], level: 'WARN'}
 }
});

exports.accessLogger = () => log4js.koaLogger(log4js.getLogger('access')); //记录所有访问级别的日志
exports.logger = log4js.getLogger('application'); //记录所有应用级别的日志

const Koa = require('koa');
const KoaRouter = require('koa-router');
const app = new Koa();
const router = new KoaRouter();
const { logger, accessLogger } = require('./logger');
const router = new KoaRouter();

app.use(accessLogger());

app.on('error', err => {
 logger.error(err);
});

router.post('/test',async (ctx, next)=>{
 //处理代码
 }catch(e){
  logger.error(e);
  ctx.body = {status:-1, message:e.message};
 }
});