时间处理函数

 // 时间转换
    function parseDateTime(num) {
        if (!!!num) {
            return "";
        }
        //最后的消息时间
        var date = new Date(+num);
        //console.log(date)
        //当前时间
        var nowDate = new Date();
        //今日零点时间
        var nowDay = new Date(nowDate.getFullYear() + "-" + (+nowDate.getMonth() + 1) + "-" + nowDate.getDate());

        var hms = date.getHours() + ":" + (date.getMinutes() < 10 ? "0" + date.getMinutes() : date.getMinutes()) + ":" + (date.getSeconds() < 10 ? "0" + date.getSeconds() : date.getSeconds());
        if (date.getTime() >= nowDay.getTime()) {
            return hms;
        }
        if (nowDay.getTime() - 1000 * 60 * 60 * 24 <= date.getTime()) {
            // return $L("yesterday") + " " + hms;
            return '昨天' + " " + hms;
        }
        var month = (+date.getMonth() + 1) < 10 ? "0" + (+date.getMonth() + 1) : (+date.getMonth() + 1);
        var day = date.getDate() < 10 ? "0" + date.getDate() : date.getDate();
        if (date.getFullYear() == nowDate.getFullYear()) {
            return month + "-" + day + " " + hms;
        }
        return (date.getFullYear() + "").substr(2, 4) + "-" + month + "-" + day + " " + hms;

    };