diff --git a/src/platforms/h5/service/api/device/get-system-info.js b/src/platforms/h5/service/api/device/get-system-info.js
index 04facc3f2f66300d505c6aead4932143f7135050..cd94b20a407ecc7a9f529b9b064dba73154bfce8 100644
--- a/src/platforms/h5/service/api/device/get-system-info.js
+++ b/src/platforms/h5/service/api/device/get-system-info.js
@@ -88,7 +88,7 @@ export function getSystemInfoSync () {
   } else if (isIPadOS) {
     model = 'iPad'
     osname = 'iPadOS'
-    osversion = window.BigInt ? '14' : '13'
+    osversion = typeof window.BigInt === 'function' ? '14' : '13'
   } else if (isWindows || isMac || isLinux) {
     model = 'PC'
     const osversionFind = ua.match(/\((.+?)\)/)[1]