fix(h5): 修复 app 初始化以前调用 uni.getSystemInfoSync 报错的问题 question/116612

src/core/service/plugins/app/create-app.js

@@ -18,14 +18,15 @@ export function getCurrentPages (isAll = false, ignoreError = false) {
   let childrenVm = app.$children[0]
   if (childrenVm && childrenVm.$children.length) {
     const tabBarVm = childrenVm.$children.find(vm => vm.$options.name === 'TabBar')
-    const layoutVm = childrenVm.$children.find(vm => vm.$options.name === 'Layout')
-    if (layoutVm) {
-      childrenVm = layoutVm
+    const layoutVm = childrenVm.$children.find(vm => vm.$options.name === 'Layout')
+    if (layoutVm) {
+      childrenVm = layoutVm
     }
     childrenVm.$children.forEach(vm => {
       if (tabBarVm !== vm && vm.$children.length && vm.$children[0].$options.name === 'Page' && vm.$children[0].$slots.page) {
         // vm.$children[0]=Page->PageBody->RealPage
-        const pageVm = vm.$children[0].$children.find(vm => vm.$options.name === 'PageBody').$children.find(vm => !!vm.$page)
+        const pageBody = vm.$children[0].$children.find(vm => vm.$options.name === 'PageBody')
+        const pageVm = pageBody && pageBody.$children.find(vm => !!vm.$page)
         if (pageVm) {
           let isActive = true
           if (!isAll && tabBarVm && pageVm.$page && pageVm.$page.meta.isTabBar) { // 选项卡仅列出活动的