从Vue2到3被TypeScript玩的正确体位

ji亟待解决的问题：

1. this的指向：定义app.config.globalProperties.$msg = 'msg'无法在vue-class-component定义的类中通过this访问到全局变量；

/** * Custom properties added to component instances in any way and can be accessed through `this` 

* * @example 
* Here is an example of adding a property `$router` to every component instance: 
* ```ts * import { createApp } from 'vue'
* import { Router, createRouter } from 'vue-router' 
* * declare module '@vue/runtime-core' { 
*   interface ComponentCustomProperties { 
*     $router: Router 
*   
} 
* 
} 
* 
* 
// effectively adding the router to every component instance * const app = createApp({}) * const router = createRouter() * app.config.globalProperties.$router = router * * const vm = app.mount('#app') * // we can access the router from the instance * vm.$router.push('/') * ``` */export interface ComponentCustomProperties {}