vue3.0 异步请求

```javascript

// api.js
const request = function() {
  return new Promise((resolve, reject)=>{
    setTimeout(()=>{
      resolve("res")
    })
  })
}

// app.vue

const getXXXInfo = function() {
   request().then(res => {
      const store = useStore();//不行
      store.commit("xxx",res); 
   })
}
setup() {
  onMounted(()=>{
   getXXXInfo();
  })
}
```

