首页商品：对齐门店「当次会话」——首次进入 / 城市变化 / 登录态变化 / 下拉刷新才拉列表，切 Tab 不再重复请求；退出登录会清缓存。

核销成功时间：按 Asia/Shanghai 格式化为「2026年8月3日 13点45分」。
核销码编号：单行省略显示，双击复制（有「双击复制」提示）。

apps/mini-user/src/pages/home/index.tsx

@@ -1,4 +1,4 @@
-import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
+import { useCallback, useMemo, useRef, useState } from 'react';
 import { View, Text, Image, Swiper, SwiperItem } from '@tarojs/components';
 import Taro, {
   useDidShow,
@@ -13,7 +13,12 @@ import CouponBadge from '../../components/CouponBadge';
 import WechatShareReady from '../../components/WechatShareReady';
 import UserTabBar, { shouldRenderPageTabBar, syncTabBarSelected } from '../../components/UserTabBar';
 import { goLogin } from '../../lib/auth-nav';
-import { isLoggedIn, request, toast } from '../../lib/api';
+import { getToken, isLoggedIn, request, toast } from '../../lib/api';
+import {
+  getHomeCatalogCache,
+  isHomeCatalogBootstrapped,
+  setHomeCatalogCache,
+} from '../../lib/home-catalog-session';
 import { ensurePayReady } from '../../lib/pay-ready';
 import { capturePromoSceneAndTouchScan } from '../../lib/promo';
 import { getProductMainImage } from '../../lib/product-images';
@@ -29,7 +34,6 @@ import {
   DEFAULT_SHARE_TITLE,
   toWeappShareMessage,
 } from '../../lib/wechat-share';
-
 type Product = {
   id: string;
   name: string;
@@ -110,35 +114,60 @@ export default function HomePage() {
       });
   }, []);
 
-  const loadProducts = useCallback(() => {
-    setLoading(true);
-    return request<Product[]>(`/catalog/products?cityCode=${encodeURIComponent(cityCode)}`)
-      .then((list) =>
-        setProducts(Array.isArray(list) ? list.map((p) => normalizeFulfillmentFlags(p)) : []),
-      )
-      .catch((e) => toast(e instanceof Error ? e.message : '加载失败'))
-      .finally(() => setLoading(false));
-  }, [cityCode]);
+  const applyProductList = useCallback((list: Product[], nextCode: string, authKey: string) => {
+    const normalized = Array.isArray(list) ? list.map((p) => normalizeFulfillmentFlags(p)) : [];
+    setProducts(normalized);
+    setHomeCatalogCache({ cityCode: nextCode, authKey, products: normalized });
+  }, []);
 
+  const fetchProducts = useCallback(
+    (nextCode: string, authKey: string) => {
+      setLoading(true);
+      return request<Product[]>(`/catalog/products?cityCode=${encodeURIComponent(nextCode)}`)
+        .then((list) => applyProductList(list, nextCode, authKey))
+        .catch((e) => toast(e instanceof Error ? e.message : '加载失败'))
+        .finally(() => setLoading(false));
+    },
+    [applyProductList],
+  );
+
+  /**
+   * 首次进入 / 城市或登录态变化：拉商品。
+   * 同次再切 tab：只同步选中态，不重复请求（对齐门店页）。
+   */
   useDidShow(() => {
     syncTabBarSelected(0);
     void capturePromoSceneAndTouchScan();
     void loadMiniHome();
-    // 白名单商品按登录手机号过滤；登录后 switchTab 回首页不会卸载页面，须重新拉列表
-    void loadProducts();
-    void resolveUserCity().then((resolved) => {
-      setDisplayCity(resolved.displayCity);
-      setCityCode(getCityCodeForCatalog(resolved));
-    });
-  });
 
-  useEffect(() => {
-    void loadProducts();
-  }, [loadProducts]);
+    const authKey = getToken() || '';
+    void (async () => {
+      const resolved = await resolveUserCity();
+      const nextCode = getCityCodeForCatalog(resolved);
+      setDisplayCity(resolved.displayCity);
+      setCityCode(nextCode);
+
+      const cache = getHomeCatalogCache();
+      if (
+        isHomeCatalogBootstrapped() &&
+        cache &&
+        cache.cityCode === nextCode &&
+        cache.authKey === authKey &&
+        Array.isArray(cache.products)
+      ) {
+        setProducts(cache.products as Product[]);
+        setLoading(false);
+        return;
+      }
+
+      await fetchProducts(nextCode, authKey);
+    })();
+  });
 
   usePullDownRefresh(() => {
     void (async () => {
       try {
+        const authKey = getToken() || '';
         const resolved = await resolveUserCity();
         setDisplayCity(resolved.displayCity);
         const nextCode = getCityCodeForCatalog(resolved);
@@ -148,7 +177,11 @@ export default function HomePage() {
           request<Product[]>(`/catalog/products?cityCode=${encodeURIComponent(nextCode)}`),
           loadMiniHome(),
         ]);
-        setProducts(Array.isArray(list) ? list.map((p) => normalizeFulfillmentFlags(p)) : []);
+        applyProductList(
+          Array.isArray(list) ? list : [],
+          nextCode,
+          authKey,
+        );
       } catch (e) {
         toast(e instanceof Error ? e.message : '加载失败');
       } finally {
@@ -157,7 +190,6 @@ export default function HomePage() {
       }
     })();
   });
-
   function openProductDetail(id: string) {
     Taro.navigateTo({ url: `/pages/product-detail/index?id=${id}` });
   }