refactor: use setup refactor

src/App.vue

@@ -1,28 +1,25 @@
-<template>
-  <el-config-provider :locale="currentLocale">
-    <router-view />
-  </el-config-provider>
-</template>
-
-<script>
+<script setup lang="ts">
+import { getCurrentInstance } from "vue";
 import { ElConfigProvider } from "element-plus";
 import zhCn from "element-plus/lib/locale/lang/zh-cn";
 import en from "element-plus/lib/locale/lang/en";
-export default {
-  name: "app",
-  components: {
-    [ElConfigProvider.name]: ElConfigProvider
-  },
-  computed: {
-    // eslint-disable-next-line vue/return-in-computed-property
-    currentLocale() {
-      switch (this.$storage.locale?.locale) {
-        case "zh":
-          return zhCn;
-        case "en":
-          return en;
-      }
-    }
+
+let locale: string =
+  getCurrentInstance().appContext.config.globalProperties.$storage?.locale
+    ?.locale;
+
+let currentLocale = () => {
+  switch (locale) {
+    case "zh":
+      return zhCn;
+    case "en":
+      return en;
   }
 };
 </script>
+
+<template>
+  <el-config-provider :locale="currentLocale()">
+    <router-view />
+  </el-config-provider>
+</template>