´ó³§(΢ÐÅ)ÃæÊÔÌâ--ʵÏÖlazyMan

ʵÏÖÒ»¸öLazyMan£¬¿ÉÒÔ°´ÕÕÒÔÏ·½Ê½µ÷ÓÃ:
LazyMan('Hank')Êä³ö:
Hi! This is Hank!
LazyMan('Hank').sleep(10).eat('dinner')Êä³ö
Hi! This is Hank!
//µÈ´ý10Ãë..
Wake up after 10
Eat dinner~
LazyMan('Hank').sleep(10).eat('dinner').eat('supper')Êä³ö
Hi This is Hank!
Eat dinner~
Eat supper~
LazyMan('Hank').sleepFirst(5).eat('supper')Êä³ö
//µÈ´ý5Ãë
Wake up after 5
Hi This is Hank!
Eat supper~
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function LazyMan(name) {
    if(!(this instanceof LazyMan)){
        return new LazyMan(name)
    }
  const cb = (next)=>{
      console.log(`Hi This is ${name}!`)
      next()
  }
  this.cbs = [cb];
  setTimeout(()=>{
    this.next()
  },0)
}
LazyMan.prototype.eat = function (food){
    const cb = (next)=>{
        console.log(`Eat ${food}~`)
        next()
    }
    this.cbs.push(cb);
    return this
}
LazyMan.prototype.sleepFirst = function (time){
    const cb = (next)=>{
        setTimeout(()=>{
            next()
        },time*1000)
    }
    this.cbs.unshift(cb);
    return this
}
LazyMan.prototype.sleep = function(time){
    const cb = (next)=>{
        setTimeout(()=>{
            next()
        },time*1000)
    }
    this.cbs.push(cb);
    return this
}
LazyMan.prototype.next = function(){
    if(this.cbs.length <= 0)return
    const first = this.cbs.shift()
    first(this.next.bind(this))
}