三七互娱的一道笔试题

var Hero = function(name) {
    if (this.constructor.name !== 'Hero') {
      return new Hero(name)
    }
    this.name = name;
    (function() {
      console.log(`Hi! this is ${name}`)
    })()
    return Promise.resolve(this)
  }

  Promise.prototype.kill = function(num) {
    return this.then(() => {
      if (num & 1 !== 0) {
        console.log(`kill ${num} 注意这里是单数`)
        return this
      }
      console.log(`kill ${num} 注意这里是复数`)
      return this
    })
  }

  Promise.prototype.recover = function(num) {
    return this.then(() => {
      console.log(`Recover ${num} bloods`)
      return this
    })
  }

  Promise.prototype.sleep = function(num) {
    return this.then(() => new Promise(resolve => {
      var timer = setTimeout(() => {
        clearTimeout(timer)
        console.log(`sleep ${num} 秒`)
        resolve(this)
      }, num * 1000)
    }))
  }

运行结果
参考：https://www.nowcoder.com/discuss/104690