Koa | 1. koa-router的使用

安装模块

npm install --save koa-router

或者配置文件package.json中依赖配置如下：

{
  "dependencies": {
    "koa": "^2.13.1",
    "koa-router": "^10.0.0",
    ...
  },
  ...
}

利用koa-router来处理URL，代码如下：

const Koa = require('koa');
const Router = require('koa-router');

// 创建一个Koa对象表示web app本身:
const app = new Koa();
const router = new Router();

// 对于任何请求，app将调用该异步函数处理请求：
app.use(async (ctx, next) => {
  console.log(`Process ${ctx.request.method} ${ctx.request.url}...`);
  await next();
});

router.get('/', async (ctx, next) => {
  ctx.response.body = `
Hello, Koa2
`;
});

router.get('/hello/:name', async (ctx, next) => {
  let name = ctx.params.name;
  ctx.response.body = `
Hello, ${name}
`
});

app.use(router.routes());

// 在端口3000监听:
app.listen(3000);
console.log('app started at port 3000...');