promise-sequence-slow.js

let actions = []

for (let i = 0; i < 10000; i++) {
	actions.push(() => Promise.resolve(i))
}


const process = (task) => task.reduce((promised, task) => promised.then(acc => task().then(value => [...acc, value])), Promise.resolve([]))

process(actions)
	.then((done) => console.log('做完了！', done))
	.catch((err) => console.error(err.message, '炸掉啦'))

promise-sequence.js

let actions = []

for (let i = 0; i < 10000; i++) {
	actions.push(() => Promise.resolve(i))
}


const process = (task) => {
	let ret = []
	return task.reduce((promised, task) => {
		return promised.then(task).then(value => {
			ret.push(value)
			return Promise.resolve(ret)
		})
	}, Promise.resolve())
}

process(actions)
	.then((done) => console.log('做完了！', done))
	.catch((err) => console.error(err.message, '炸掉啦'))