web -- Navigator.vibrate(); 使设备（有振动硬件）产生有频率的振动

MDN 文档

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 = `
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <h1 id="h">hello2</h1>
    <script>
      document.getElementById('h').onclick = function(e){
         window.navigator.vibrate([200, 100]);
      }
    </script>
    `
}).routes();
app.use(Index);

app.listen(1995);