实现一个异步并发调度器

class Scheduler {
            constructor(limit) {
                this.limit = limit
                this.number = 0
                this.queue = []
            }
            addTask(timeout, str) {
                this.queue.push([timeout, str])
            }
            start() {
                if (this.number < this.limit&&this.queue.length) {
                    var [timeout, str] = this.queue.shift()
                    this.number++
                    setTimeout(() => {
                        console.log(str)
                        this.number--
                        this.start()
                    }, timeout * 1000);
                    this.start()
                }
            }
 }

ref

https://juejin.cn/post/6913493585363599373