chore: add trailingComma

src/image-preview/demo/index.vue

@@ -41,7 +41,7 @@ const images = [
   'https://img.yzcdn.cn/vant/apple-1.jpg',
   'https://img.yzcdn.cn/vant/apple-2.jpg',
   'https://img.yzcdn.cn/vant/apple-3.jpg',
-  'https://img.yzcdn.cn/vant/apple-4.jpg'
+  'https://img.yzcdn.cn/vant/apple-4.jpg',
 ];
 
 export default {
@@ -51,22 +51,22 @@ export default {
       button2: '指定初始位置',
       button3: '异步关闭',
       componentCall: '组件调用',
-      index: index => `第${index + 1}页`
+      index: index => `第${index + 1}页`,
     },
     'en-US': {
       button1: 'Show Images',
       button2: 'Custom Start Position',
       button3: 'Async Close',
       componentCall: 'Component Call',
-      index: index => `Page: ${index}`
-    }
+      index: index => `Page: ${index}`,
+    },
   },
 
   data() {
     return {
       show: false,
       images,
-      index: 0
+      index: 0,
     };
   },
 
@@ -86,7 +86,7 @@ export default {
         swipeDuration: 300,
         asyncClose: !!timer,
         closeOnPopstate: true,
-        startPosition: typeof position === 'number' ? position : 0
+        startPosition: typeof position === 'number' ? position : 0,
       });
 
       if (timer) {
@@ -94,8 +94,8 @@ export default {
           instance.close();
         }, timer);
       }
-    }
-  }
+    },
+  },
 };
 </script>