Function push

interview/limit.js:28–34

(fn,resolve,args)

    next() //下一个
  }
  const push = async (fn,resolve,args)=>{
    queue.push(run.bind(null,fn,resolve,args))
    if(activeCount<maxCount && queue.length>0){
      // 队列没满 并且还有任务 启动任务
      queue.shift()()
    }
  }

  let runner = (fn,...args)=>{
    return new Promise((resolve)=>{