fix: compatible with vue old version inject

src/mixin/format.js

@@ -1,12 +1,8 @@
 import { format } from 'date-format-parse';
-import { getLocale } from '../locale';
+import LocaleMixin from './locale';
 
 export default {
-  inject: {
-    locale: {
-      default: getLocale(),
-    },
-  },
+  mixins: [LocaleMixin],
   methods: {
     formatDate(date, fmt) {
       return format(date, fmt, { locale: this.t('formatLocale') });

src/mixin/locale.js

@@ -9,7 +9,7 @@ export default {
   methods: {
     t(path) {
       const arr = path.split('.');
-      let current = this.locale;
+      let current = this.locale || getLocale();
       let value;
       for (let i = 0, len = arr.length; i < len; i++) {
         const prop = arr[i];