如何使用GetX可观测变量？

dependencies:
  flutter:
    sdk: flutter
  get: ^4.1.4

import 'package:get/get.dart';

class CounterController extends GetxController {
  var count = 0.obs; // 使用.obs将变量声明为可观测变量

  void increment() {
    count.value++; // 使用.value来访问可观测变量的值
  }
}

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

class CounterPage extends StatelessWidget {
  final CounterController _controller = Get.put(CounterController());

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('GetX Counter'),
      ),
      body: Center(
        child: Obx(() => Text(
          'Count: ${_controller.count.value}', // 使用.value来访问可观测变量的值
          style: TextStyle(fontSize: 24),
        )),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _controller.increment,
        child: Icon(Icons.add),
      ),
    );
  }
}