SOURCE

async function wait(ms) {
    return new Promise((res, rej) => {
        setTimeout(() => {
            res(new Date().valueOf());
        }, ms);
    });
}

// 并行
// (async () => {
//     const p0 = wait(1000);
//     const p1 = wait(1000);
//     const c = await p0;
//     const d = await p1;
//     console.log(c, d);
// })();

// 同步等待
(async () => {
    const c = await wait(1000);
    const d = await wait(1000);
    console.log(c, d);
})();