Flutter:如何监听GetX上的变量变化

import 'package:flutter/material.dart';
import 'package:get/get.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return GetMaterialApp(
      home: Home(),
    );
  }
}

class Home extends StatelessWidget {
  final CounterController counterController = Get.put(CounterController());

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('GetX Counter'),
      ),
      body: Center(
        child: Obx(() => Text('Count: ${counterController.count.value}')),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: counterController.increment,
        child: Icon(Icons.add),
      ),
    );
  }
}

class CounterController extends GetxController {
  final count = 0.obs;

  void increment() {
    count.value++;
  }
}