fix(频道切换)：增加切换刷新接口控制

@@ -28,7 +28,7 @@ export struct PageComponent {
   // 自动刷新通知
   @Prop @Watch('onAutoRefresh') autoRefresh: number = 0
   private listScroller: Scroller = new Scroller();
-
+  needload: boolean = true;
   build() {
     Column() {
       if (this.pageModel.viewType == ViewType.LOADING) {
@@ -220,13 +220,17 @@ export struct PageComponent {
     // 选中tab，才请求数据。拦截大量接口请求
     if (this.navIndex === this.currentTopNavSelectedIndex) {
       this.getData();
+      this.needload = false;
     }
   }
 
   onChange() {
     Logger.info(TAG, `onChangezz id: ${this.pageId} , ${this.channelId} , ${this.navIndex} , navIndex: ${this.currentTopNavSelectedIndex}`);
     if (this.navIndex === this.currentTopNavSelectedIndex) {
-      this.getData();
+      if(this.needload){
+        this.getData();
+      }
+      this.needload = false;
     }
   }