如何使用Fetch api获取CORS请求中的头部字段

const url = 'https://example.com/api/data';
const options = {
  method: 'GET',
  headers: {
    'Content-Type': 'application/json',
    'Authorization': 'Bearer token123'
  },
  mode: 'cors'
};

const request = new Request(url, options);

fetch(request)
  .then(response => {
    // 检查响应是否成功
    if (response.ok) {
      // 获取头部字段
      const headers = response.headers;
      const headerValue = headers.get('Header-Name');
      console.log(headerValue);
    } else {
      throw new Error('请求失败');
    }
  })
  .catch(error => {
    console.error(error);
  });