docs(Image): use composition api

src/image/demo/index.vue

@@ -58,9 +58,10 @@
   </demo-block>
 </template>
 
-<script>
-export default {
-  i18n: {
+<script lang="ts">
+import { useTranslate } from '@demo/use-translate';
+
+const i18n = {
   'zh-CN': {
     fitMode: '填充模式',
     round: '圆形图片',
@@ -79,10 +80,14 @@ export default {
     customTip: 'Custom Tip',
     loadFail: 'Load failed',
   },
-  },
+};
+
+export default {
+  setup() {
+    const t = useTranslate(i18n);
 
-  data() {
     return {
+      t,
       image: 'https://img.yzcdn.cn/vant/cat.jpeg',
       fits: ['contain', 'cover', 'fill', 'none', 'scale-down'],
     };