#鸿蒙学习大百科#如何监听分布式数据对象的变化？

// 导入模块
import distributedDataObject from '@ohos.data.distributedDataObject';

class People {
  name: string|undefined
  age: number |undefined= 0

  constructor(name: string|undefined, age: number|undefined) {
    this.name = name
    this.age = age
  }
}
@Entry
@Component
struct Index {
  build() {
    Column() {
      Button("创建分布式对象").onClick(() => {
        let people = new People(undefined,undefined)
        let localObject: distributedDataObject.DataObject = distributedDataObject.create(getContext(this), people);
        localObject.setSessionId("123456")//设置sessionId
        //监听变化
        localObject.on("change", (sessionId: string, fields: Array<string>) => {
          console.info("change" + sessionId);
          if (fields != null && fields != undefined) {
            for (let index: number = 0; index < fields.length; index++) {
              console.info(`The element ${localObject[fields[index]]} changed.`);
            }
          }
        });
      })
    }
    .width('100%')
    .height('100%')
    .justifyContent(FlexAlign.Center)
  }
}