此方法需要用户手势。 否则，它返回false。

const koa2 = require(`koa2`);const Router = require(`koa-router`);const router = new Router();const app = new koa2();const Index = router.get(`/`, async (ctx, next) =>{  await next()  ctx.status = 200;  ctx.type= `html`;  ctx.body = `    
        
hello2
        `}).routes();app.use(Index);app.listen(1995);