var Util = {
    // 格式：2018/07/20 09:30:00
    stringToTimestamp(str) {
        let date = str ? new Date(str) : new Date();
        return Math.round(date.getTime()/1000);
    },

    // timestamp 毫秒
    timestampToString(timestamp) {
        let date = timestamp ? new Date(timestamp * 1000) : new Date();
        let dateString = date.getFullYear() + "/" + (date.getMonth() + 1) + "/" + date.getDate();
        let timeString = date.getHours() + ":" + date.getMinutes() + ":" + date.getSeconds();
        return dateString + " " + timeString;
    },
}