perf: 优化首页返回时的卡顿问题

- 避免onShow每次都重新加载商品数据
- 添加needRefresh标志控制是否需要刷新
- 在onHide/onUnload时标记需要刷新
- 返回首页时仅在需要时才刷新列表

pages/index/index.js

@@ -44,6 +44,9 @@ Page({
     previewImageUrls: [],
     previewImageIndex: 0,
     showImagePreview: false,
+    
+    // 页面刷新标志
+    needRefresh: false,
   },
 
   // 跳转到聊天页面
@@ -189,7 +192,18 @@ Page({
     app.updateCurrentTab('index');
     app.globalData.showTabBar = true;
     this.checkAndRestoreLoginStatus()
-    this.refreshGoodsList()
+    if (this.data.needRefresh) {
+      this.setData({ needRefresh: false })
+      this.refreshGoodsList()
+    }
+  },
+
+  onHide: function () {
+    this.setData({ needRefresh: true })
+  },
+
+  onUnload: function () {
+    this.setData({ needRefresh: true })
   },
 
   onPullDownRefresh: function() {

pages/index/index.wxml

@@ -218,7 +218,7 @@
                     <view class="status-tag negotiate-{{item.negotiateStatus === '可议价' ? 'yes' : 'no'}}">{{item.negotiateStatus}}</view>
                   </view>
                   <view class="product-meta">
-                    <text class="sales-count">已售{{item.sales || item.reservedCount || 0}}件</text>
+                    <text class="sales-count">已有{{item.reservedCount || 0}}人收藏</text>
                     <text class="product-location">{{item.region || ''}}</text>
                   </view>
                 </view>
@@ -276,7 +276,7 @@
                     <view class="status-tag negotiate-{{item.negotiateStatus === '可议价' ? 'yes' : 'no'}}">{{item.negotiateStatus}}</view>
                   </view>
                   <view class="product-meta">
-                    <text class="sales-count">已售{{item.sales || item.reservedCount || 0}}件</text>
+                    <text class="sales-count">已有{{item.reservedCount || 0}}人收藏</text>
                     <text class="product-location">{{item.region || ''}}</text>
                   </view>
                 </view>