修复一个很隐藏的小问题

src/utils/mixins.js

 import fetch from '@/utils/fetch'
 import { getBaseUrl, getApiUrl } from '@/utils/index'
-import { getCookie } from "@/utils/index";
-
+import { getCookie, delCookie } from "@/utils/index";
 
 module.exports = {
     data: function () {