/**
 * 给一个时间戳,返回距离现在多久了
 * @param time 一个时间戳
 * @returns {*} 时间差
 */
function returnTime(time) {
    if (isNaN(time) === true)
        return "Error!" + '"' + time + '"' + " is NaN";
    if (time < 0) return "Error! 过去的时间大于现在的时间!";
    else {
        var diffValue = (Date.now() - time) / 1000 / 60;
        if (diffValue < 1) return "刚刚";
        if (diffValue < 60) return parseInt(diffValue) + "分钟前";
        if (diffValue < 60 * 24) return parseInt(diffValue / 60) + "小时前";
        if (diffValue < 60 * 24 * 30) return parseInt(diffValue / 60 / 24) + "天前";
        return parseInt(diffValue / 60 / 24 / 30) + "月前";
    }
}

document.write(returnTime(1509019200000));