如何监听Viewmodel里变量值的变化

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%’) 
} 
}