HarmonyOS 标注的viewModel应该怎么设计，可以达到响应式

struct Index { 
 @State viewModule: MyViewModule = new MyViewModule(); 
 @State newName: string = ‘’; 
 build() { 
  Row() { 
   Column() { 
    Text(${this.newName}) 
    .fontSize(50) 
     .fontWeight(FontWeight.Bold) 
    Button(‘change name’) 
    .onClick(() => { 
     this.viewModule.userInfo.name = “aaa”; 
     this.newName = this.viewModule.userInfo.name; 
     hilog.info(0x0000, ‘testTag’, ‘name = %{public}s’, this.viewModule.userInfo.name); 
    }) 
   } 
  } 
  .height(‘100%’) 
 } 
}