js倒计时

function countDown(year, month, day, shi) {
    var end = new Date(year, month - 1, day, shi);
    var leftTime = end.getTime() - Date.now();
    var day1 = Math.floor(leftTime / 1000 / 60 / 60 / 24);
    var h = Math.floor(leftTime / 1000 / 60 / 60 % 24);
    h < 10 ? h = "0" + h : h = h
    var m = Math.floor(leftTime / 1000 / 60 % 60);
    m < 10 ? m = "0" + m : m = m
    var s = Math.floor(leftTime / 1000 % 60);
    s < 10 ? s = "0" + s : s = s;
    // var str = "距离国庆还剩" +day1+"天"+h+"小时"+m+"分"+s+"秒"
    var str = h + "小时" + m + "分" + s + "秒"
    console.log('str: ', str);

    setTimeout("test('" + year + "','" + month + "','" + day + "','" + shi + "')", 1000);
}

countDown(2020, 02, 26, 19); // 直接传入需要的日期就可以使用了