fix by huangtao

 <template>
-  <div ref="layout" class="layout" @touchstart="webviewScrollStart" @touchmove="webviewScrollMove" @touchend="webviewScrollEnd">
+  <div ref="layout" class="layout" @touchstart="webviewScrollStart" @touchmove="webviewScrollMove"
+       @touchend="webviewScrollEnd">
     <slot name="header">
       <LayoutHeader v-if="!hideHeader"
                     class="layout-header"
@@ -60,7 +61,7 @@ export default {
 
         this.touchMoveY = e.changedTouches[0].pageY;
 
-        if (scrollTop <= 0 && this.touchMoveY > scrollTop ) {
+        if (scrollTop <= 0 && this.touchMoveY > scrollTop) {
           e.preventDefault();
         }
         this.message = 'scrollTop:' + scrollTop + 'touchmove:' + this.touchMoveY;