错误处理指南

// 完整的错误处理示例
class APIError extends Error {
  constructor(message, status, code) {
    super(message);
    this.status = status;
    this.code = code;
  }
}

async function handleAPICall() {
  try {
    const response = await fetch('/api/chat', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ /* ... */ })
    });
    
    if (!response.ok) {
      const error = await response.json();
      
      switch (response.status) {
        case 400:
          throw new APIError('请求参数错误', 400, error.code);
        case 401:
          throw new APIError('认证失败', 401, error.code);
        case 429:
          throw new APIError('请求过于频繁', 429, error.code);
        case 500:
          throw new APIError('服务器错误', 500, error.code);
        default:
          throw new APIError('未知错误', response.status, error.code);
      }
    }
    
    return await response.json();
  } catch (error) {
    console.error('API调用失败:', error);
    // 记录日志、显示用户友好的错误信息等
    throw error;
  }
}