feat: 扫码进去小程序的几种方式兼容支持

src/pages/index/index.vue

@@ -2,11 +2,21 @@
 /**
  * 主包壳页面：主页 / 权益 / 我的 三块面板同屏共存，底部 Tab 栏只渲染一次
  * ---------------------------------------------------------------------------
+ * 扫码入口：二维码指向本页并带商家 id（`merchant_id` / `scene` / `q` 三种来源都认），
+ * 进来自动切到权益 Tab 再打开商家详情 —— 取值见 utils/nav.js 的 pickMerchantId / handleEntry。
  */
-import { onMounted, ref } from "vue";
-import { onShow } from "@dcloudio/uni-app";
+import { nextTick, onMounted, ref } from "vue";
+import { onLoad, onShow } from "@dcloudio/uni-app";
 import { TABS } from "@/constant";
-import { consumePendingTab, registerTabController, setTabQuery } from "@/utils/nav";
+import {
+  consumePendingMerchant,
+  consumePendingTab,
+  goDetail,
+  pickMerchantId,
+  registerTabController,
+  setPendingMerchant,
+  setTabQuery,
+} from "@/utils/nav";
 import HomePanel from "@/views/home/index.vue";
 import BenefitPanel from "@/views/benefit/index.vue";
 import MinePanel from "@/views/mine/index.vue";
@@ -32,17 +42,39 @@ const goTab = (key, query = "") => {
   showPanel(key);
 };
 
+/** Tab 控制器是否已就绪（onShow 可能早于 onMounted，未就绪时不消费扫码参数） */
+let shellReady = false;
+
+/**
+ * 扫码进店：先切权益 Tab 再打开商家详情。
+ * 顺序不能反 —— 先切 Tab，「详情返回」才会落在权益页而不是主页。
+ */
+const runEntry = () => {
+  if (!shellReady) return;
+  const id = consumePendingMerchant();
+  if (!id) return;
+  goTab("benefit");
+  nextTick(() => setTimeout(() => goDetail(id), 0));
+};
+
+onLoad((options) => {
+  setPendingMerchant(pickMerchantId(options));
+});
+
 onMounted(() => {
   // 面板的 onMounted 早于本页 onMounted，此时 ref 已就绪
   registerTabController({ go: goTab, getActive: () => active.value });
   // 从子页 / 登录页切过来：nav 里可能压着待切 Tab（登录回跳、reLaunch 冷启）
   const pending = consumePendingTab();
   goTab(pending?.key || active.value, pending?.query || "");
+  shellReady = true;
+  runEntry();
 });
 
 onShow(() => {
   // 从板块列表 / 详情 / 登录页等返回：让当前面板按需刷新（各家内部有幂等守卫）
   showPanel(active.value);
+  runEntry();
 });
 </script>