```javascript
class Scheduler {
constructor() {
this.__maxQueueSize = 2;
this.__runningJobs = [];
this.__pendingQueue = [];
}

get isJobsFull() {
return this.__maxQueueSize <= this.__runningJobs.length;
}

static jobWrapper(promiseCreator) {
Scheduler.__jobId += 1;
const id = Scheduler.__jobId;
const wrappedPromise = promiseCreator().then((result) => {
return {
id,
result
};
});
wrappedPromise.__jobId = id;
return wrappedPromise;
}

removeFinishedJob(id) {
console.log(`remove ${id}`);
this.__runningJobs = this.__runningJobs.reduce((curr, job) => {
if (job.__jobId !== id) {
curr.push(job);
}
return curr;
}, []);
console.log(this.__runningJobs);
}

async add(promiseCreator) {
if (!this.isJobsFull) {
const job = Scheduler.jobWrapper(promiseCreator);
this.__runningJobs.push(job);
const {result, id} = await job;
this.removeFinishedJob(id);
return result;
} else {
this.__pendingQueue.unshift(promiseCreator);
await Promise.race(this.__runningJobs);
if (this.__pendingQueue.length > 0) {
return this.add(this.__pendingQueue.pop());
}
}
}
}

Scheduler.__jobId = 0;
```

昨晚一时兴起写了一下，希望对你有帮助。。

没得选 家就在一线
而且并不是某村村民

又挂了

@BenX AC+ 可以退吗? 我前几天打过电话给客服，他们说服务类的不能退