fix(Tabs): 修复选项卡竖向滚动时不触发scroll事件 (#2299)

packages/tabs/index.ts

@@ -301,6 +301,10 @@ VantComponent({
       );
     },
 
+    onTouchScroll(event: Weapp.TouchEvent) {
+      this.$emit('scroll', event.detail);
+    },
+
     onTouchStart(event: Weapp.TouchEvent) {
       if (!this.data.swipeable) return;
 

packages/tabs/index.wxml

@@ -1,7 +1,7 @@
 <wxs src="../wxs/utils.wxs" module="utils" />
 
 <view class="custom-class {{ utils.bem('tabs', [type]) }}">
-  <van-sticky disabled="{{ !sticky }}" z-index="{{ zIndex }}" offset-top="{{ offsetTop }}">
+  <van-sticky disabled="{{ !sticky }}" z-index="{{ zIndex }}" offset-top="{{ offsetTop }}" bind:scroll="onTouchScroll">
     <view class="{{ utils.bem('tabs__wrap', { scrollable }) }} {{ type === 'line' && border ? 'van-hairline--top-bottom' : '' }}">
       <slot name="nav-left" />