问题主要来自于在子类中调用action时，出现了Cannot read properties of undefined (reading 'generateGitAPI')的问题，拷了个简易版过来，实际版本与此类似，报的是this.generateGitAPI is not a function，都是由下面的这种写法引起的

/*
 * @Description: 封装install命令注册，继承自父类command
 */

/**
 * @description: 通过Builder模式对各个command完成注册
 */
'use strict';

let cmd = {
  action(fn) {
    fn()
  }
}

class Command {
  constructor(instance) {
	// Cannot read properties of undefined (reading 'generateGitAPI') ||  ...is not a function
    cmd.action(this.action)
	
	// 正常调用子类中的generateGitAPI，及searchGitAPI
    // cmd.action(() => {
    //   this.action()
    // })
  }

  get command() {
    throw new Error('command must implements')
  }

  get description() {
    throw new Error('description must implements')
  }

  get options() {
    return []
  }

  get action() {
    throw new Error('action must implements') 
  }

  preAction() {
    console.log('pre')
  }

  postAction() {
    console.log('post')
  }
}


class InstallCommand extends Command {

  constructor() {
    super()
  }

  get command() {
    return 'install'
  }

  get description() {
    return '下载项目'
  }

  get options() {
    return []
  }

  async action() {
    await this.generateGitAPI()
    await this.searchGitAPI()
  }

  /**
   * @description: 生成GitAPI
   */  
  async generateGitAPI() {
    console.log('generateGitAPI')
  }

  /**
   * @description: 在git进行搜索
   */  
  async searchGitAPI() {
    console.log('searchGitAPI')
  }
}

const comman =  new InstallCommand()

以前老师说过，碰到this之类的问题，等它执行时才能知道this指向哪，但上面这个例子我依旧有些懵逼，请老师帮忙解答下疑问