将Fetch Wrapper转换为Typescript

class FetchWrapper {
  // 构造函数，可以在这里进行一些初始化操作
  constructor() {}

  // 封装GET请求
  get(url: string, headers?: HeadersInit): Promise<Response> {
    return fetch(url, { method: 'GET', headers });
  }

  // 封装POST请求
  post(url: string, body: BodyInit, headers?: HeadersInit): Promise<Response> {
    return fetch(url, { method: 'POST', body, headers });
  }

  // 封装PUT请求
  put(url: string, body: BodyInit, headers?: HeadersInit): Promise<Response> {
    return fetch(url, { method: 'PUT', body, headers });
  }

  // 封装DELETE请求
  delete(url: string, headers?: HeadersInit): Promise<Response> {
    return fetch(url, { method: 'DELETE', headers });
  }
}

import FetchWrapper from './fetchWrapper';

const fetchWrapper = new FetchWrapper();

fetchWrapper.get('https://api.example.com/data')
  .then(response => response.json())
  .then(data => {
    // 处理返回的数据
  })
  .catch(error => {
    // 处理错误
  });