chore: prettier source code

src/tabs/index.js

@@ -27,7 +27,7 @@ const [createComponent, bem] = createNamespace('tabs');
 export default createComponent({
   mixins: [
     ParentMixin('vanTabs'),
-    BindEventMixin(function(bind) {
+    BindEventMixin(function (bind) {
       if (!this.scroller) {
         this.scroller = getScroller(this.$el);
       }
@@ -231,7 +231,7 @@ export default createComponent({
 
     // correct the index of active tab
     setCurrentIndexByName(name) {
-      const matched = this.children.filter(tab => tab.computedName === name);
+      const matched = this.children.filter((tab) => tab.computedName === name);
       const defaultIndex = (this.children[0] || {}).index || 0;
       this.setCurrentIndex(matched.length ? matched[0].index : defaultIndex);
     },