const Koa &＃61; require(&＃39;koa&＃39;);const app &＃61; new Koa();// 1. 中间件的演示// app.use(async (ctx, next) &＃61;> {// console.log(&＃96;${ctx.request.method} ${ctx.request.url}&＃96;);// await next();// })// app.use(async (ctx, next) &＃61;> {// const start &＃61; new Date().getTime(); //当前时间// await next();// const ms &＃61; new Date().getTime() - start;// console.log(&＃96;Time: ${ms}ms&＃96;)// })// app.use(async (ctx, next) &＃61;> {// await next();// ctx.type &＃61; &＃39;text/html&＃39;;// ctx.body &＃61; &＃39;Hello, Koa2!&＃39;;// })// 2. 设置不同的路由演示// app.use(async (ctx, next) &＃61;> {// if(ctx.url &＃61;&＃61;&＃61; &＃39;/&＃39;) ctx.body &＃61; &＃39;index page&＃39;// else await next();// })// app.use(async (ctx, next) &＃61;> {// if(ctx.url &＃61;&＃61;&＃61; &＃39;/test&＃39;) ctx.body &＃61; &＃39;test page&＃39;// else await next();// })// app.use(async (ctx, next) &＃61;> {// if(ctx.url &＃61;&＃61;&＃61; &＃39;/error&＃39;) ctx.body &＃61; &＃39;error page&＃39;// else await next();// })// 3. 使用koa-router 改进2的代码// npm i koa-router// const router &＃61; require(&＃39;koa-router&＃39;)();// 注意这里是一个函数// app.use(async (ctx, next) &＃61;> {// console.log(&＃96;Process ${ctx.method} ${ctx.url}...&＃96;);// await next();// });// router.get(&＃39;/hello/:name&＃39;, async (ctx, next) &＃61;> {// let name &＃61; ctx.params.name;// ctx.body &＃61; &＃96;Hello, ${name} !&＃96;// })// router.get(&＃39;/&＃39;, async (ctx, next) &＃61;> {// ctx.body &＃61; &＃96; Index &＃96;// })// app.use(router.routes());//将router.routes()注册到app//注意&＃xff0c;这句话一般是要放到最后的&＃xff0c;因为这句话之后的中间件都不会执行。// 4. 使用 koa-router 的 post 请求中间件问题const router &＃61; require(&＃39;koa-router&＃39;)();const bodyParser &＃61; require(&＃39;koa-bodyparser&＃39;);// npm i koa-bodyparserapp.use(bodyParser());router.get(&＃39;/&＃39;, async (ctx, next) &＃61;> {ctx.body &＃61; &＃96; Index Name: Password: &＃96;})router.post(&＃39;/signin&＃39;, async (ctx, next) &＃61;> {let name &＃61; ctx.request.body.name || &＃39;&＃39;;let password &＃61; ctx.request.body.password || &＃39;&＃39;;console.log(&＃96;signin with name: ${name} , password: ${password}&＃96;);if(name &＃61;&＃61;&＃61; &＃39;koa&＃39; && password &＃61;&＃61;&＃61; &＃39;12345&＃39;) {ctx.body &＃61; &＃96; Welcome, ${name}&＃96;;}else {ctx.body &＃61; &＃96; Login failed! Try again &＃96;}})app.use(router.routes());app.listen(3000)
Name:
Password:
Try again
京公网安备 11010802041100号