!20745 拖拽示例修改

Merge pull request !20745 from xionghao1002/docs

zh-cn/application-dev/reference/arkui-ts/ts-universal-attributes-drag-drop.md

@@ -31,16 +31,6 @@ struct ImageExample {
   @State AVisible: Visibility = Visibility.Visible
   @State dragSuccess :Boolean = false
 
-  @Builder pixelMapBuilder() {
-    Column() {
-      Column()
-        .width(100)
-        .height(100)
-        .borderRadius(10)
-        .backgroundColor(Color.Yellow)
-    }
-  }
-
   build() {
     Column() {
       Text('Image拖拽')
@@ -52,12 +42,6 @@ struct ImageExample {
           .border({ width: 1 })
           .visibility(this.AVisible)
           .draggable(true)
-          .onDragStart((event: DragEvent, extraParams: string) => {
-            let image = new UDMF.Image();
-            let unifiedData = new UDMF.UnifiedData(image);
-            event.setData(unifiedData);
-            return this.pixelMapBuilder()
-          })
           .onDragEnd((event: DragEvent) => {
             let ret = event.getResult();
             if(ret == 0) {