Helper/Config.php
public function getAdditionalJS($storeId = null)
    {
        return $this->getScopeConfig()->getValue(
            self::XML_PATH_ADDITIONAL_JS,
            ScopeInterface::SCOPE_STORE,
            $storeId
        );
    }
public function getAdditionalJS($storeId = null)
    {
        return $this->getScopeConfig()->getValue(
            self::XML_PATH_ADDITIONAL_JS,
            ScopeInterface::SCOPE_STORE,
            $storeId
        );
    }
public function getAdditionalJS ( $ storeId = null ) { return $ this -> getScopeConfig ( ) -> getValue ( self :: XML_PATH_ADDITIONAL_JS , ScopeInterface :: SCOPE_STORE , $ storeId ) ; }
Get Additional Javascript from config

@param int|string $storeId

@return  string
Get Additional Javascript from config