HarmonyOS TextInput如何clearFocus

import { inputMethod } from '@kit.IMEKit' 
 
@Entry 
@Component 
struct TextInputClearFocusExample { 
  controller: TextInputController = new TextInputController() 
 
  build() { 
    Column() { 
      TextInput({ placeholder: "输入" }) 
        .onChange((value: string) => { 
          if (value.length >= 10) { 
            inputMethod.getController().hideTextInput(); 
            focusControl.requestFocus('butt') 
          } 
        }) 
      Button() 
        .width(0) 
        .height(0) 
        .id('butt') 
    } 
  } 
}