修改 touch-event.uvue 示例 添加条件编译避免在Android 平台报错

(cherry picked from commit 4c382abf)

pages/component/global-events/touch-events.uvue

@@ -39,10 +39,11 @@
     },
     onReady() {
       this.icon = uni.getElementById("icon")
-      this.iconRect = this.icon.getBoundingClientRect()
-
+      // #ifdef APP-IOS
+      this.iconRect = this.icon?.getBoundingClientRect()
       // 加上导航栏及状态栏高度
       this.iconRect.y += uni.getSystemInfoSync().safeArea.top + 44
+      // #endif
     },
     methods: {
       onViewTouchStart(e : TouchEvent) {