HarmonyOS 如何根据配置字符串去调用方法

参考demo：

export class dddd {
  fun : Record<string, Function> = {};

  constructor() {
    this.fun={'ssss':this.ddd1,'sdss':this.ccc}
  }
  ddd1(){
    console.log('ddd1')
  }
  ccc(){
    console.log('cccc')
  }
}
//调用时：
import display from '@ohos.display';
import { dddd } from './FunTest';


@Entry
@Component
struct DisplayTest {
  private ddd : dddd = new dddd()
  build() {
    Column({space:20}){
      Button('Test')
        .type(ButtonType.Capsule)
        .onClick(() => {
          this.ddd.fun['ssss']()
          this.ddd.fun['sdss']()
        })
        .width('50%')
    }
    .width("100%")
    .height('100%')
    .justifyContent(FlexAlign.Center)
  }
}