半屏弹窗示例兼容Web端在弹窗区触摸操作与浏览器全局手势冲突的问题

pages/template/half-screen/half-screen.uvue

@@ -78,6 +78,7 @@
             this.halfOffset = offset;
           }
         }
+        e.preventDefault();
       },
       onHalfTouchEnd(_ : TouchEvent) {
         this.halfScreenY = 0;