diff --git a/extensions/cocostudio/CCSSceneReader.cpp b/extensions/cocostudio/CCSSceneReader.cpp
index bc9ef36809..834008a434 100644
--- a/extensions/cocostudio/CCSSceneReader.cpp
+++ b/extensions/cocostudio/CCSSceneReader.cpp
@@ -355,13 +355,9 @@ Node* SceneReader::createObject(const rapidjson::Value &dict, cocos2d::Node* par
     
 cocos2d::Node* SceneReader::createObject(CocoLoader *cocoLoader, stExpCocoNode *cocoNode, cocos2d::Node* parent, AttachComponentType attachComponent)
 {
-    const char *className = nullptr;
     stExpCocoNode *pNodeArray = cocoNode->GetChildArray(cocoLoader);
     std::string Key = pNodeArray[1].GetName(cocoLoader);
-    if (Key == "classname")
-    {
-        className = pNodeArray[1].GetValue(cocoLoader);
-    }
+    const char *className = Key == "classname" ? pNodeArray[1].GetValue(cocoLoader) : "";
     if(strcmp(className, "CCNode") == 0)
     {
         Node* gb = nullptr;
diff --git a/extensions/cocostudio/TriggerBase.cpp b/extensions/cocostudio/TriggerBase.cpp
index ec031f2378..4338a47f77 100644
--- a/extensions/cocostudio/TriggerBase.cpp
+++ b/extensions/cocostudio/TriggerBase.cpp
@@ -1,7 +1,8 @@
 /****************************************************************************
 Copyright (c) 2013-2017 Chukong Technologies Inc.
+Copyright (c) 2021 Bytedance Inc.
 
-http://www.cocos2d-x.org
+ https://adxe.org
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -31,7 +32,7 @@ using namespace cocostudio;
 void sendEvent(unsigned int event)
 {
     char buf[10];
-    sprintf(buf, "%d", event);
+    sprintf(buf, "%u", event);
     std::string custom_event_name(buf);
 
     EventCustom eventCustom(custom_event_name);
diff --git a/extensions/scripting/lua-bindings/manual/LuaBasicConversions.cpp b/extensions/scripting/lua-bindings/manual/LuaBasicConversions.cpp
index 48d32815de..a064a1b4c8 100644
--- a/extensions/scripting/lua-bindings/manual/LuaBasicConversions.cpp
+++ b/extensions/scripting/lua-bindings/manual/LuaBasicConversions.cpp
@@ -867,8 +867,6 @@ bool luaval_to_fontdefinition(lua_State* L, int lo, FontDefinition* outValue , c
     if (NULL == L || NULL == outValue)
         return false;
 
-    bool ok = true;
-
     tolua_Error tolua_err;
     bool ok = !!tolua_istable(L, lo, 0, &tolua_err);
     if (ok)