设计含有异步队列执行任务的class

实现效果

LazyMan('Tony').sleep(10).eat('lunch').eat('dinner')

class LazyManClass{
  constructor(name){
    this.name=name;
    this.queue=[];
    console.log(`Hi I am ${name}`); 
    setTimeout(()=>{
      this.next();
    },0)
  }
  
  sleep(time){
    const fn=()=>{
      setTimeout(()=>{
         console.log(`等待了${time}秒...`)
          this.next()
       },time*1000)
   }   
     this.queue.unshift(fn);
    return this
   }
  
  eat(food){
      const fn=()=>{
       console.log(`iam eating ${food}`)
        this.next()
       }
      this.queue.push(fn)
      return this 
    }
   
  next(){
    const fn=this.queue.shift();
    fn && fn();
    }
     
 
}
const LazyMan=(name)=>{ 
  return new LazyManClass(name)
};
LazyMan('Tony').sleep(10).eat('lunch').eat('dinner')