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class Scheduler {
constructor() {
this.queue = []; // 存储任务的队列
this.maxConcurrent = 2; // 最大并发数
this.runningCount = 0; // 当前正在运行的任务数
}
add(promiseCreator) {
return new Promise((resolve, reject) => {
// 将任务添加到队列中
this.queue.push({ promiseCreator, resolve, reject });
// 如果当前正在运行的任务数小于最大并发数,则执行任务
if (this.runningCount < this.maxConcurrent) {
this.runTask();
}
});
}
runTask() {
if (this.queue.length === 0) return; // 队列为空,直接返回
const { promiseCreator, resolve, reject } = this.queue.shift();
this.runningCount++; // 当前正在运行的任务数加一
promiseCreator()
.then(resolve)
.catch(reject)
.finally(() => {
this.runningCount--; // 当前正在运行的任务数减一
this.runTask(); // 继续执行下一个任务
});
}
}
const timeout = (time) => new Promise((resolve) => setTimeout(resolve, time));
const scheduler = new Scheduler();
const addTask = (time, order) => {
scheduler.add(() => timeout(time)).then(() => console.log(order));
};
addTask(1000, "1");
addTask(500, "2");
addTask(300, "3");
addTask(400, "4");
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