About js promises

promises.js

let promise1 = () => {
	return new Promise((resolve, reject) => {
		setTimeout(() => {
			resolve('promise1 done')
		}, 5000)
	})	
}

let promise2 = () => {
	return new Promise((resolve, reject) => {
		setTimeout(() => {
			resolve('promise2 done')
		}, 4000)
	})	
}

let promise3 = () => {
	return new Promise((resolve, reject) => {
		setTimeout(() => {
			reject('promise3 fail')
		}, 1000)
	})	
}

let testPromiseAll = async () => {
	let resultAll = await Promise.all([promise1().then(result => console.log(result)), promise2().then(result => console.log(result)), promise3().then(result => console.log(result)).catch(err => console.log(err))])
	
	console.log('testPromiseAll done')
	
	return resultAll
}