diff --git a/lib/utils/script.js b/lib/utils/script.js
index c09aad1..8cfb69b 100644
--- a/lib/utils/script.js
+++ b/lib/utils/script.js
@@ -90,16 +90,16 @@ utils.script = {
     return '(document.body || document.documentElement).appendChild' + utils.script.methodHead([name])
   },
   forceGC: function () {
-    if (platform.isMozilla) {
+    if (utils.platform.isMozilla) {
     }
-    if (platform.isChrome) {
+    if (utils.platform.isChrome) {
       if (window.GCController) {
         return GCController.collect() // eslint-disable-line no-undef
       }
     }
-    if (platform.isSafari) {
+    if (utils.platform.isSafari) {
     }
-    if (platform.isIE) {
+    if (utils.platform.isIE) {
     }
   },
   getRandomElement: function () {