JavaScript异步任务执行参考

let allCount = 3;
let time1 = 0;
let time2 = 0;

function proTest() {
    console.log("pro...test");
    test();
}

function test() {
    setTimeout(() => {
        console.log('test...',allCount)
        if (allCount == 0) {
            time2 = new Date().getSeconds();
            console.log(`运行时间${time2 - time1}秒`);
            return;
        }
        allCount--;
        proTest();
    },1000 * allCount)
}

time1 = new Date().getSeconds();
proTest();