function timeout(time) {
return new Promise((resolve) => {
setTimeout(resolve, time);
});
}
class ParalleTask {
constructor(paralleCount = 2) {
this.tasks = [];
this.paralleCount = paralleCount;
this.runningCount = 0;
}
add(task) {
return new Promise((resolve, reject) => {
this.tasks.push({ task, resolve, reject });
this._run();
});
}
_run() {
while (this.runningCount < this.paralleCount && this.tasks.length) {
this.runningCount++;
const { task, resolve, reject } = this.tasks.shift();
task()
.then(resolve)
.catch(reject)
.finally(() => {
this.runningCount--;
this._run();
});
}
}
}
const superTask = new ParalleTask();
function addTask(time, name) {
superTask
.add(() => timeout(time))
.then(() => {
console.log(`${name} is done`);
});
}
addTask(10000, "Task 1");
addTask(5000, "Task 2");
addTask(3000, "Task 3");
addTask(4000, "Task 4");
addTask(5000, "Task 5");
// after 5 second, finish Task 2
// then after 3 second, finish Task 3
// then after 2 second, finish Task 1
// then after 2 second, finish Task 4
// then after 3 second, finish Task 5
// Total 15 seconds
标签:addTask,Task,Javascript,finish,second,resolve,Paralle,after From: https://www.cnblogs.com/Answer1215/p/18395463