记一个延时执行队列的实现

class Quene {
  constructor(ms) {
    this.quene = [];
    this.interval = ms;
    this.timer = null;
  }

  enquene(cb) {
    this.quene.push(cb);
    this.consume();
  }

  consumeItem() {
    const cb = this.quene.shift();
    cb();
    if (!this.quene.length) {
      clearInterval(this.timer);
      this.timer = null;
    }
  }

  consume() {
    if (!this.timer) {
      this.timer = setInterval(this.consumeItem.bind(this), this.interval);
    }
  }
}

const q = new Quene(1000);

q.enquene(() => {
  console.log(new Date(), 1);
});
q.enquene(() => {
  console.log(new Date(), 2);
});
q.enquene(() => {
  console.log(new Date(), 3);
});