feat: 优化API错误处理、CORS支持、请求日志、404处理

- 添加CORS headers支持跨域访问
- 添加请求日志记录
- 改善各API的错误处理
- 添加404处理器
- 添加timestamp返回便于调试

server.js

@@ -2,37 +2,73 @@ const express = require('express');
 const path = require('path');
 
 const app = express();
-const PORT = 3000;
+const PORT = process.env.PORT || 3000;
 
 // Middleware
 app.use(express.json());
 app.use(express.static(path.join(__dirname, 'public')));
 
+// CORS headers
+app.use((req, res, next) => {
+  res.header('Access-Control-Allow-Origin', '*');
+  res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
+  res.header('Access-Control-Allow-Methods', 'GET, POST, OPTIONS');
+  if (req.method === 'OPTIONS') {
+    return res.sendStatus(200);
+  }
+  next();
+});
+
+// Request logging
+app.use((req, res, next) => {
+  const start = Date.now();
+  res.on('finish', () => {
+    const duration = Date.now() - start;
+    console.log(`${req.method} ${req.path} - ${res.statusCode} (${duration}ms)`);
+  });
+  next();
+});
+
 // API: 搜索优惠券 (预留淘宝/京东联盟API接入点)
 app.get('/api/search', async (req, res) => {
   const { keyword } = req.query;
   if (!keyword) {
-    return res.json({ success: false, message: '请输入搜索关键词' });
+    return res.status(400).json({ success: false, message: '请输入搜索关键词' });
   }
 
+  try {
     // TODO: 接入淘宝联盟API / 京东联盟API
     // 目前返回模拟数据用于本地验证
     const mockResults = generateMockResults(keyword);
-  res.json({ success: true, data: mockResults });
+    res.json({ success: true, data: mockResults, keyword, timestamp: Date.now() });
+  } catch (error) {
+    console.error('搜索API错误:', error);
+    res.status(500).json({ success: false, message: '服务器错误，请重试' });
+  }
 });
 
 // API: 今日特价
 app.get('/api/today-deals', (req, res) => {
+  try {
     // TODO: 接入真实特价API
     const deals = generateMockDeals();
-  res.json({ success: true, data: deals });
+    res.json({ success: true, data: deals, timestamp: Date.now() });
+  } catch (error) {
+    console.error('特价API错误:', error);
+    res.status(500).json({ success: false, message: '服务器错误，请重试' });
+  }
 });
 
 // API: 线报广场
 app.get('/api/linbao', (req, res) => {
+  try {
     // TODO: 接入线报数据源
     const linbao = generateMockLinbao();
-  res.json({ success: true, data: linbao });
+    res.json({ success: true, data: linbao, timestamp: Date.now() });
+  } catch (error) {
+    console.error('线报API错误:', error);
+    res.status(500).json({ success: false, message: '服务器错误，请重试' });
+  }
 });
 
 // API: 历史价格查询 (预留)
@@ -60,6 +96,11 @@ app.get('/', (req, res) => {
   res.sendFile(path.join(__dirname, 'public', 'index.html'));
 });
 
+// 404 handler
+app.use((req, res) => {
+  res.status(404).json({ success: false, message: 'API不存在' });
+});
+
 // Mock data generators
 function generateMockResults(keyword) {
   return [