HarmonyOS 如何实现手机号344格式实现？

// xxx.ets  
@Entry  
@Component  
struct TextInputExample1 {  
  controller: TextInputController = new TextInputController()  
  @State inputValue: string = ""  
  // 自定义键盘组件  
  @Builder CustomKeyboardBuilder() {  
    Column() {  
      Button('true').onClick(() => {  
        // 关闭自定义键盘  
        this.controller.stopEditing()  
      })  
      Grid() {  
        ForEach([1, 2, 3, 4, 5, 6, 7, 8, 9, 'space', 0, 'delect'], (item:number|string) => {  
          GridItem() {  
            Button(item + "")  
              .width(110).onClick(() => {  
              if(item==="space"){  
                this.inputValue+=" "  
              } else if (item==="delect"){  
                console.log(this.inputValue.length.toString());  
                this.inputValue = this.inputValue.slice(0, -1);  
              }else{  
                this.inputValue += item  
              }  
            })  
          }  
        })  
      }.maxCount(3).columnsGap(10).rowsGap(10).padding(5)  
    }.backgroundColor(Color.Gray)  
  }  
  build() {  
    Column() {  
      TextInput({ controller: this.controller, text: this.inputValue })  
        // 绑定自定义键盘  
        .customKeyboard(this.CustomKeyboardBuilder()).margin(10).border({ width: 1 }).height('48vp')  
    }  
  }  
}