[improvement] Remove create & i18 mixin (#2670)

docs/src/demo-common.js

@@ -5,7 +5,7 @@
 import Vue from 'vue';
 import VueRouter from 'vue-router';
 import VantDoc, { DemoBlock, DemoSection } from '@vant/doc';
-import i18n from '../../packages/mixins/i18n';
+import i18n from './utils/i18n';
 import Vant, { Lazyload, Locale } from '../../packages';
 import { camelize } from '../../packages/utils';
 

docs/src/utils/i18n.js

@@ -0,0 +1,24 @@
+// component mixin
+import { get, camelize } from '../../../packages/utils';
+
+export default {
+  computed: {
+    $t() {
+      const { name } = this.$options;
+      const prefix = name ? camelize(name) + '.' : '';
+
+      if (!this.$vantMessages) {
+        if (process.env.NODE_ENV !== 'production') {
+          console.error('[Vant] Locale not correctly registered');
+        }
+        return () => '';
+      }
+
+      const messages = this.$vantMessages[this.$vantLang];
+      return (path, ...args) => {
+        const message = get(messages, prefix + path) || get(messages, path);
+        return typeof message === 'function' ? message(...args) : message;
+      };
+    }
+  }
+};