001: 实现下面这道题目中的machine函数

[metro2703]

function machine(name) {
    
}
machine('thewall').execute() 
// start thewall
machine('thewall').do('eat').execute(); 
// start thewall
// thewall eat
machine('thewall').wait(5).do('eat').execute();
// start thewall
// wait 5s（这里等待了5s）
// thewall eat
machine('thewall').waitFirst(5).do('eat').execute();
// wait 5s
// start thewall
// thewall eat

[metro2703]

function machine(name){
	return new Machine(name);
}
function Machine(name){
	this.name = name;
	this.action = [];
	this.init();
}
Machine.prototype.init = function () {
	this.action.push(`start ${this.name}`);
}
Machine.prototype.execute = function () {
	for (var i = 0; i < this.action.length; i++) {
		console.log(this.action[i]);
		if(this.action[i].indexOf('wait')){
			var time = this.action[i].slice(5,6);
			// await new Promise((resolve)=>{
			//	setTimeout(resolve,time*1000);
			// })
			// 怎么实现停留5秒?懵逼了
		}
	}
}
Machine.prototype.do = function (thing) {
	this.action.push(`${this.name} ${thing}`);
		return this;
}
Machine.prototype.wait = function (second) {
	this.action.push(`wait ${second}s`);
	return this;
}
Machine.prototype.waitFirst = function (firstSecond) {
	this.action.unshift(`wait ${firstSecond}s`);
	return this;
}
machine('zhangsan').wait(5).do('eat').execute()