feat: 优化筛选缓存逻辑

- 点击筛选时优先使用本地缓存，避免重复查询数据库
- 下拉加载更多时强制请求服务器，确保数据完整性
- 修复切换分类时数据丢失问题
- 缓存有效期设置为5分钟

pages/index/index.js

@@ -49,6 +49,12 @@ Page({
     page: 1,
     pageSize: 8,
     
+    // 商品数据缓存
+    goodsCache: [],
+    categoryQueryCache: {},
+    lastDataTimestamp: 0,
+    cacheValidDuration: 5 * 60 * 1000, // 缓存有效期5分钟
+    
     // 防抖定时器
     searchDebounceTimer: null,
     scrollDebounceTimer: null,
@@ -676,12 +682,29 @@ Page({
     });
   },
   
-  // 加载商品数据 - 淘宝风格优化
-  loadGoods: function(isLoadMore = false) {
+  // 加载商品数据 - 优化版带缓存
+  loadGoods: function(isLoadMore = false, forceRefresh = false) {
     if (isLoadMore && !this.data.hasMoreData) {
       return
     }
     
+    const currentCategory = this.data.selectedCategory === '全部' ? '' : this.data.selectedCategory;
+    const currentKeyword = this.data.searchKeyword;
+    const cacheKey = `${currentCategory}_${currentKeyword}`;
+    const now = new Date().getTime();
+    
+    // 只有非加载更多模式才使用缓存
+    if (!isLoadMore && !forceRefresh && 
+        this.data.categoryQueryCache[cacheKey] && 
+        (now - this.data.lastDataTimestamp) < this.data.cacheValidDuration) {
+      console.log('使用缓存数据，cacheKey:', cacheKey);
+      const cachedGoods = this.data.categoryQueryCache[cacheKey];
+      // 更新timestamp以确保缓存有效
+      this.setData({ lastDataTimestamp: now });
+      this.processCachedGoods(cachedGoods, isLoadMore);
+      return;
+    }
+    
     if (isLoadMore) {
       this.setData({ loadingMore: true })
     } else {
@@ -689,15 +712,15 @@ Page({
     }
     
     const timestamp = new Date().getTime();
-    const currentPage = isLoadMore ? this.data.page : 1
+    const page = isLoadMore ? this.data.page : 1
     
     API.getProductList('published', {
       timestamp: timestamp,
       viewMode: 'shopping',
-      page: currentPage,
+      page: page,
       pageSize: this.data.pageSize,
-      keyword: this.data.searchKeyword,
-      category: this.data.selectedCategory === '全部' ? '' : this.data.selectedCategory
+      keyword: currentKeyword,
+      category: currentCategory
     })
     .then(res => {
       wx.hideLoading();
@@ -713,9 +736,19 @@ Page({
       if (res.success && res.products) {
         const totalGoods = res.total || 0;
         const totalPages = res.totalPages || Math.ceil(totalGoods / this.data.pageSize);
-        const hasMoreData = currentPage < totalPages && res.products.length > 0;
+        const hasMoreData = page < totalPages && res.products.length > 0;
+        
+        // 更新缓存
+        const updatedCache = { ...this.data.categoryQueryCache };
+        updatedCache[cacheKey] = res.products;
+        
+        this.setData({ 
+          hasMoreData,
+          categoryQueryCache: updatedCache,
+          lastDataTimestamp: now,
+          goodsCache: res.products
+        })
         
-        this.setData({ hasMoreData })
         this.processGoodsData(res.products, isLoadMore)
       } else {
         this.setData({ loadingMore: false, isLoading: false })
@@ -727,6 +760,59 @@ Page({
     })
   },
   
+  // 处理缓存的商品数据
+  processCachedGoods: function(cachedGoods, isLoadMore) {
+    console.log('processCachedGoods 被调用, isLoadMore:', isLoadMore);
+    
+    // 处理商品数据格式
+    const processedGoods = cachedGoods.map(product => {
+      const imageUrls = product.imageUrls || product.images || [];
+      const formattedImageUrls = Array.isArray(imageUrls) ? imageUrls : [imageUrls];
+      
+      return {
+        ...product,
+        category: product.category || '',
+        fullRegion: product.region || '',
+        region: product.region ? this.extractProvince(product.region) : '',
+        grossWeight: product.grossWeight || product.weight || '',
+        displayGrossWeight: product.grossWeight || product.weight || '',
+        status: product.status || 'published',
+        createdAt: product.created_at || product.createTime || null,
+        reservedCount: product.reservedCount || product.selected || 0,
+        reservedCountDisplay: product.reservedCount || product.selected || 0,
+        sales: product.sales || product.reservedCount || Math.floor(Math.random() * 1000) + 100,
+        product_contact: product.product_contact || '',
+        contact_phone: product.contact_phone || '',
+        supplyStatus: product.supplyStatus || '',
+        sourceType: product.sourceType || '',
+        negotiateStatus: '可议价',
+        isReserved: false,
+        isFavorite: false,
+        currentImageIndex: 0,
+        imageUrls: formattedImageUrls
+      }
+    });
+    
+    // 更新收藏状态
+    this.updateGoodsFavoriteStatus(processedGoods, false);
+    
+    // 应用筛选条件
+    let filteredGoods = this.applyFilters(processedGoods, false);
+    
+    // 分配到两列
+    const { leftColumnGoods, rightColumnGoods } = this.distributeToColumns(filteredGoods);
+    
+    this.setData({
+      goods: processedGoods,
+      filteredGoods: filteredGoods,
+      leftColumnGoods: leftColumnGoods,
+      rightColumnGoods: rightColumnGoods,
+      loadingMore: false,
+      isLoading: false,
+      hasMoreData: false // 缓存数据不分页
+    });
+  },
+  
   // 刷新商品列表
   refreshGoodsList: function() {
     this.setData({
@@ -1004,8 +1090,23 @@ Page({
       isLoading: true
     })
     
+    const currentCategory = category === '全部' ? '' : category;
+    const currentKeyword = this.data.searchKeyword;
+    const cacheKey = `${currentCategory}_${currentKeyword}`;
+    const now = new Date().getTime();
+    
+    // 检查缓存（首次加载时使用缓存，加载更多时不用）
+    if (this.data.categoryQueryCache[cacheKey] && 
+        (now - this.data.lastDataTimestamp) < this.data.cacheValidDuration) {
+      console.log('selectCategory使用缓存数据，cacheKey:', cacheKey);
+      const cachedGoods = this.data.categoryQueryCache[cacheKey];
+      // 更新timestamp以确保缓存有效
+      this.setData({ lastDataTimestamp: now });
+      this.processCachedGoods(cachedGoods, false);
+    } else {
       // 重新从服务器加载数据
       this.loadGoods(false)
+    }
   },
   
   // 查看商品详情