fetch('https://example.com/api/data')
  .then(response => response.text()) // 先获取原始文本
  .then(text => {
    console.log('原始响应:', text);
    try {
      const json = JSON.parse(text);
      console.log('解析成功:', json);
    } catch (e) {
      console.error('JSON解析错误:', e);
    }
  })
  .catch(error => console.error('请求失败:', error));

fetch('https://example.com/api/data')
  .then(response => {
    console.log('Content-Type:', response.headers.get('Content-Type'));
    if (!response.headers.get('Content-Type').includes('application/json')) {
      throw new Error('响应不是JSON格式');
    }
    return response.json();
  })
  // ...其余处理

fetch('https://example.com/api/data', {
  headers: {
    'Accept-Encoding': 'gzip'
  }
})
.then(response => {
  const contentEncoding = response.headers.get('Content-Encoding');
  if (contentEncoding && contentEncoding.includes('gzip')) {
    // 需要解压处理
    return response.blob().then(blob => {
      // 使用解压库处理blob
    });
  }
  return response.json();
})

async function fetchJson(url) {
  try {
    const response = await fetch(url);
    
    if (!response.ok) {
      throw new Error(`HTTP错误! 状态码: ${response.status}`);
    }
    
    const contentType = response.headers.get('Content-Type');
    if (!contentType || !contentType.includes('application/json')) {
      const text = await response.text();
      throw new Error(`预期JSON但收到: ${contentType}, 内容: ${text.substring(0, 100)}`);
    }
    
    return await response.json();
  } catch (error) {
    console.error('获取JSON失败:', error);
    throw error; // 或者返回默认值/错误对象
  }
}