update zh-cn/application-dev/quick-start/arkts-rendering-control-lazyforeach.md.

Signed-off-by: N耿文广 <gengwenguang@huawei.com>

zh-cn/application-dev/quick-start/arkts-rendering-control-lazyforeach.md

@@ -9,22 +9,22 @@ LazyForEach从提供的数据源中按需迭代数据，并在每次迭代过程
 
 ```ts
 LazyForEach(
-    dataSource: IDataSource,             // Data source to iterate over
-    itemGenerator: (item: Object) => void,  // Child component generation function
-    keyGenerator?: (item: Object): string => string // (Optional). ID generation function
+    dataSource: IDataSource,             // 需要进行数据迭代的数据源
+    itemGenerator: (item: Object) => void,  // 需要进行数据迭代的数据源
+    keyGenerator?: (item: Object): string => string // 需要进行数据迭代的数据源
 ): void
 interface IDataSource {
-    totalCount(): number;                                             // Get total count of data
-    getData(index: number): any;                                      // Get single data by index
-    registerDataChangeListener(listener: DataChangeListener): void;   // Register listener to listening data changes
-    unregisterDataChangeListener(listener: DataChangeListener): void; // Unregister listener
+    totalCount(): number;                                             // 获得数据总数
+    getData(index: number): any;                                      // 获取索引值对应的数据
+    registerDataChangeListener(listener: DataChangeListener): void;   // 注册数据改变的监听器
+    unregisterDataChangeListener(listener: DataChangeListener): void; // 注销数据改变的监听器
 }
 interface DataChangeListener {
-    onDataReloaded(): void;                      // Called while data reloaded
-    onDataAdd(index: number): void;            // Called while single data added
-    onDataMove(from: number, to: number): void; // Called while single data moved
-    onDataDelete(index: number): void;          // Called while single data deleted
-    onDataChange(index: number): void;          // Called while single data changed
+    onDataReloaded(): void;                      // 重新加载数据时调用
+    onDataAdd(index: number): void;            // 添加数据时调用
+    onDataMove(from: number, to: number): void; // 数据移动起始位置与数据移动目标位置交换时调用
+    onDataDelete(index: number): void;          // 删除数据时调用
+    onDataChange(index: number): void;          // 改变数据时调用
 }
 ```
 
@@ -177,7 +177,7 @@ class BasicDataSource implements IDataSource {
 }
 
 class MyDataSource extends BasicDataSource {
-  private dataArray: string[] = ['/path/image0', '/path/image1', '/path/image2', '/path/image3'];
+  private dataArray: string[] = [];
 
   public totalCount(): number {
     return this.dataArray.length;
@@ -201,6 +201,12 @@ class MyDataSource extends BasicDataSource {
 @Entry
 @Component
 struct MyComponent {
+  aboutToAppear() {
+    for (var i = 100; i >= 80; i--) {
+      this.data.pushData(`Hello ${i}`)
+    }
+  }
+
   private data: MyDataSource = new MyDataSource();
 
   build() {
@@ -208,14 +214,17 @@ struct MyComponent {
       LazyForEach(this.data, (item: string) => {
         ListItem() {
           Row() {
-            Image(item).width('30%').height(50)
-            Text(item).fontSize(20).margin({ left: 10 })
+            Text(item).fontSize(50)
+              .onAppear(() => {
+                console.info("appear:" + item)
+              })
           }.margin({ left: 10, right: 10 })
         }
         .onClick(() => {
-          this.data.pushData('/path/image' + this.data.totalCount());
+          this.data.pushData(`Hello ${this.data.totalCount()}`);
         })
-      }, (item: string) => item)
+      }, item => item)
+    }.cachedCount(5)
     }
   }
 }