new Step()步骤类Source@typex-core/transform/step.js, line 3Methodsapply() → {*}执行正操作Source@typex-core/transform/step.js, line 19Returns:Type: *(abstract) applyAction()正操作 - 需要在子类中实现正操作Source@typex-core/transform/step.js, line 48invert()执行逆操作Source@typex-core/transform/step.js, line 33(abstract) invertAction()逆操作 - 需要在子类中实现逆操作Source@typex-core/transform/step.js, line 58