text: async function welcome(ctx, next) {
      ctx.body = `<h1>Welcome to Koa!</h1>`;
  }
  
  
  async function hello(ctx, next) {
      ctx.body = `<h1>Hello, world!</h1>`;
  }
  
  
  module.exports = [
      ['get', '/', welcome],
      ['get', '/hello', hello]
  ];
  