如何在Jenkins mix管道中改变全局变量？

pipeline {
    agent any
    stages {
        stage('Change Global Variable') {
            steps {
                script {
                    // 获取全局变量的当前值
                    def globalVar = env.GLOBAL_VAR
                    echo "Current value of GLOBAL_VAR: ${globalVar}"
                    
                    // 修改全局变量的值
                    env.GLOBAL_VAR = "new value"
                    echo "New value of GLOBAL_VAR: ${env.GLOBAL_VAR}"
                }
            }
        }
    }
}