命令模式（javascript）版13

/*class Receiver
{
	exec()
	{
		console.log('执行')
	}
} 
class Command
{
	constructor(Receiver)
	{
		this.Receiver=Receiver;//我的下面是士兵
	}
	cmd()
	{
		 console.log('触发命令')//击鼓中
		this.Receiver.exec();//小号手叫士兵执行命令进攻
	}
}
class Invoker
{
	constructor(Command)
	{//我的下面是小号手
		this.Command=Command;//小号手知道了
		console.log("开始");
	}
	invoke()
	{
		this.Command.cmd();
	}
}
let soldier=new Receiver();
let trumpeter=new Command(soldier);
//我叫
let general=new Invoker(trumpeter);
//我叫小号手击鼓
general.invoke();
*/