如何在flutter中单击按钮时将参数传递给web服务

dependencies:
  http: ^0.13.3

import 'package:http/http.dart' as http;

void sendRequest(String parameter) async {
  var url = Uri.parse('https://example.com/api'); // 替换为你的Web服务URL
  var response = await http.post(url, body: {'parameter': parameter});

  if (response.statusCode == 200) {
    // 请求成功
    print('参数已成功传递给Web服务');
  } else {
    // 请求失败
    print('请求失败：${response.statusCode}');
  }
}

ElevatedButton(
  onPressed: () {
    String parameter = 'your_parameter'; // 替换为你的参数
    sendRequest(parameter);
  },
  child: Text('点击按钮'),
)