diff --git a/yelaymaths/app.js b/yelaymaths/app.js
index 8d1d4b9..cc6170c 100644
--- a/yelaymaths/app.js
+++ b/yelaymaths/app.js
@@ -10,6 +10,42 @@ App({
 
   onLaunch() {
     this.globalData.ready = this.bootstrap();
+    this.watchUpdates();
+  },
+
+  /**
+   * 版本更新监听。**只在这里注册一次**。
+   *
+   * 以前写在首页的 onShow 里，每切回首页就注册一遍；微信这个接口不去重，
+   * 回调会一层层叠加，同一次更新会连着弹好几个弹窗。放在 App 里天然只执行一次。
+   *
+   * 提示文案来自后台配置，所以要等启动流程把配置读回来再弹，避免弹出空白内容。
+   */
+  watchUpdates() {
+    const updateManager = wx.getUpdateManager();
+
+    updateManager.onUpdateReady(() => {
+      void this.ready().then(() => {
+        wx.showModal({
+          title: store.cfg('app.update.title'),
+          showCancel: false,
+          content: store.cfg('app.update.content'),
+          success: (res) => {
+            if (res.confirm) updateManager.applyUpdate();
+          },
+        });
+      });
+    });
+
+    updateManager.onUpdateFailed(() => {
+      void this.ready().then(() => {
+        wx.showModal({
+          title: store.cfg('app.update.title'),
+          showCancel: false,
+          content: store.cfg('app.update.failed'),
+        });
+      });
+    });
   },
 
   /**
diff --git a/yelaymaths/pages/index/index.js b/yelaymaths/pages/index/index.js
index e233dde..261df9e 100644
--- a/yelaymaths/pages/index/index.js
+++ b/yelaymaths/pages/index/index.js
@@ -4,7 +4,6 @@ const store = require('../../utils/store');
 const config = require('../../config/index');
 
 const app = getApp();
-const updateManager = wx.getUpdateManager();
 
 const PAGE_SIZE = 10;
 
@@ -107,21 +106,6 @@ Page({
       .catch((err) => console.error('[index] 文章加载失败', err));
   },
 
-  onShow() {
-    updateManager.onCheckForUpdate(() => {});
-    updateManager.onUpdateReady(() => {
-      wx.showModal({
-        title: store.cfg('app.update.title'),
-        showCancel: false,
-        content: store.cfg('app.update.content'),
-        success: (res) => {
-          if (res.confirm) updateManager.applyUpdate();
-        },
-      });
-    });
-    updateManager.onUpdateFailed(() => {});
-  },
-
   onPullDownRefresh() {
     Promise.all([this.reload()]).then(() => wx.stopPullDownRefresh());
   },