NodeJS优雅的实现Sleep休眠

先打印1，然后1.5秒后打印2

/*
休眠函数sleep
调用 await sleep(1500)
 */
function sleep(ms) {
    return new Promise(resolve=>setTimeout(resolve, ms))
}
async function main() {
    console.log(1)
    await sleep(1500)
    console.log(2)
}
main()