如何从Jenkinsfile设置环境变量

pipeline {
    agent any
    environment {
        MY_VARIABLE = 'my_value'
    }
    stages {
        // 定义各个阶段
    }
}

pipeline {
    agent any
    environment {
        MY_VARIABLE = 'my_value'
    }
    stages {
        stage('Build') {
            steps {
                echo "My variable value is ${MY_VARIABLE}"
                // 执行其他构建步骤
            }
        }
    }
}

pipeline {
    agent any
    stages {
        stage('Build') {
            steps {
                script {
                    if (env.BRANCH_NAME == 'master') {
                        env.MY_VARIABLE = 'master_value'
                    } else {
                        env.MY_VARIABLE = 'other_value'
                    }
                }
                echo "My variable value is ${MY_VARIABLE}"
                // 执行其他构建步骤
            }
        }
    }
}