app.$http = axios; Can LOGIN now

src/types/vue.d.ts

@@ -0,0 +1,14 @@
+import { AxiosInstance } from 'axios';
+import { App } from 'vue';
+
+declare module '@vue/runtime-core' {
+  interface ComponentCustomProperties {
+    $http: AxiosInstance;
+  }
+}
+
+// 將類型擴展到 Vue 應用實例
+declare module 'vue' {
+  interface App {
+    $http: AxiosInstance;
+  }