HarmonyOS list局部刷新的问题

可以使用@State和@Observed，父组件和Entry中调用的组件建立双向连接，去实现这个功能，这样就可以实现数据的局部刷新了，参考示例如下：

@Component
struct Child {
  @Link items: TestList[];

  build() {
    Column() {
      ForEach(this.items, (item: TestList) => {
        ChildChild({ item: item });
      })
      Button(`Button: push`).onClick(() => {
        this.items[0].index1 = 3;
        this.items[0].str = 'Third';
      })
    }
  }
}

@Component
struct ChildChild {
  @State item: TestList = new TestList();

  build() {
    Column() {
      Text(`${this.item.index1}+'-----'${this.item.str}`)
    }
  }
}

@Entry
@Component
struct Parent {
  @State arr: TestList[] = [];

  aboutToAppear() {
    let test1: TestList = new TestList();
    test1.index1 = 1;
    test1.str = 'First';
    this.arr.push(test1)
    let test2: TestList = new TestList();
    test2.index1 = 2;
    test2.str = 'Second';
    this.arr.push(test2)
  }

  build() {
    Column() {
      Child({ items: this.arr })
      Button(`Button: push`).onClick(() => {
        this.arr[1].index1 = 4;
        this.arr[1].str = 'Fourth';
      })
    }
  }
}

@Observed
class TestList {
  index1: number = 0;
  str: string = '';
}
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.