feat: 英文字母描红开发

miniprogram/pages/favorites/favorites.ts

@@ -1,5 +1,8 @@
 import { NAV_INNER_PX } from '../../utils/navMetrics';
 
+const { statusBarHeight } = wx.getWindowInfo();
+const NAV_BLOCK_HEIGHT = statusBarHeight + NAV_INNER_PX;
+
 type FavoritesTab = 'favorites' | 'downloads';
 
 type FavoriteItem =
@@ -114,9 +117,6 @@ const MOCK_DOWNLOADS: DownloadSection[] = [
 
 Page({
     data: {
-        statusBarHeight: 0,
-        navBlockHeight: 0,
-        /** 纵向 scroll-view 可视高度（窗口高 − 顶栏占位，避免内容滚入导航下） */
         favScrollHeight: 0,
         activeTab: 'favorites' as FavoritesTab,
         favoriteList: MOCK_FAVORITES as FavoriteItem[],
@@ -125,11 +125,8 @@ Page({
 
     onLoad() {
         const win = wx.getWindowInfo();
-        const navBlockHeight = win.statusBarHeight + NAV_INNER_PX;
         this.setData({
-            statusBarHeight: win.statusBarHeight,
-            navBlockHeight,
-            favScrollHeight: win.windowHeight - navBlockHeight,
+            favScrollHeight: win.windowHeight - NAV_BLOCK_HEIGHT,
         });
     },