秒前,分钟前,小时前,月前,年前转换的简便算法

formatDate: function( dataStamp ) {
    const time = Math.floor(( Date.now() - Date.parse( dataStamp ) ) / 1000);
    const arr = ["年前", "月前", "天前", "小时前", "分钟前", "秒前"];
    const narr = [31536000, 2592000, 86400, 3600, 60, 1];
    for (let i = 0; i < narr.length; i++) {
        const flag = Math.floor(time / narr[i]);
        if (flag > 0) {
        return flag + arr[i];
        }
    }
    return 1 + "秒前";
}