es6实现一个sleep函数

简单实现

var sleep = async (duration) => {
    return new Promise((resolve, reject) => {
        setTimeout(resolve, duration);
    });
};
(async () => {
    console.log("start!"+new Date().toISOString());
    console.time("timer1");
    await sleep(2000);//阻塞该async方法的执行线程，直到sleep()返回的Promise resolve
    console.timeEnd("timer1");
    console.log("end"+new Date().toISOString());
})();
console.log("after sleep test!");

输出

start!2017-11-11T11:25:28.834Z
after sleep test!
timer1: 2000.845947265625ms
end2017-11-11T11:25:30.838Z

赏

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