js格式化时间日期

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// 时间格式化
function format_date(timeStamp) {
    let date = new Date(timeStamp);
    return date.getFullYear() + "年"
        + prefix_zero(date.getMonth() + 1) + "月"
        + prefix_zero(date.getDate()) + "日 "
        + prefix_zero(date.getHours()) + ":"
        + prefix_zero(date.getMinutes());
}

// 数字格式化
function prefix_zero(num) {
    return num >= 10 ? num : "0" + num;
}

// 倒计时时间格式化
function format_time(timeStamp) {
    let day = Math.floor(timeStamp / (24 * 3600 * 1000));
    let leave1 = timeStamp % (24 * 3600 * 1000);
    let hours = Math.floor(leave1 / (3600 * 1000));
    let leave2 = leave1 % (3600 * 1000);
    let minutes = Math.floor(leave2 / (60 * 1000));
    let leave3 = leave2 % (60 * 1000);
    let seconds = Math.floor(leave3 / 1000);
    if (day) return day + "天" + hours + "小时" + minutes + "分";
    if (hours) return hours + "小时" + minutes + "分" + seconds + "秒";
    if (minutes) return minutes + "分" + seconds + "秒";
    if (seconds) return seconds + "秒";
    return "时间到!";
}