Merge pull request #70 from xiaofan9/bug_fix-vue2-ts-err

Fix the bug that the attribute does not exist in vue2 + ts

Author: imcvampire

index.d.ts

@@ -12,6 +12,17 @@ declare module "@vue/runtime-core" {
   }
 }
 
+declare module 'vue/types/vue' {
+  interface Vue {
+    $http: AxiosStatic;
+    axios: AxiosStatic;
+  }
+
+  interface VueConstructor {
+    axios: AxiosStatic;
+  }
+}
+
 declare function VueAxios(app: App, axios: AxiosStatic): void;
 
 export default VueAxios;