fix(H5): 设置tabbar高度后，getSystemInfoSync()获取windowBottom的高度错误 question/121154

src/platforms/h5/view/bridge/subscribe/index.js

@@ -23,10 +23,11 @@ const passiveOptions = supportsPassive ? {
 
 function updateCssVar (vm) {
   if (uni.canIUse('css.var')) {
+    const uniConfigTabbarHeight = parseFloat(__uniConfig.tabBar.height)
     const pageVm = vm.$parent.$parent
     const navigationBarType = pageVm.navigationBar.type
     const windowTopValue = navigationBarType === 'default' || navigationBarType === 'float' ? NAVBAR_HEIGHT : 0
-    const windowBottomValue = getApp().$children[0].showTabBar ? TABBAR_HEIGHT : 0
+    const windowBottomValue = getApp().$children[0].showTabBar ? isNaN(uniConfigTabbarHeight) ? TABBAR_HEIGHT : uniConfigTabbarHeight : 0
     const envMethod = uni.canIUse('css.env') ? 'env' : (uni.canIUse('css.constant') ? 'constant' : '')
     const windowTop = windowTopValue && envMethod ? `calc(${windowTopValue}px + ${envMethod}(safe-area-inset-top))`
       : `${windowTopValue}px`
@@ -87,4 +88,4 @@ export default function initSubscribe (subscribe) {
       })
     }
   })
-}
+}