Vue3.0+ts 全局挂载axios

在文件 main.ts 添加 带有 + 符号后代码

//  main.ts
import { createApp } from "vue";
import App from "./App.vue";
+ import axios, { AxiosInstance } from "axios";

+ declare module "@vue/runtime-core" {
+  interface ComponentCustomProperties {
+    $http: AxiosInstance;
+  }
+ }

const app = createApp(App);
+ app.config.globalProperties.$http = axios;
app.mount("#app")