将时间戳转为 Y-M-D h:m:s

/**将时间戳转为 2018-12-27 15:16:30 */

 time(e) {
        let date = new Date(e);
        let Y = date.getFullYear() + '-';
        let M = (date.getMonth()+1 < 10 ? '0'+(date.getMonth()+1) : date.getMonth()+1) + '-';
        let D = (date.getDate() < 10 ? '0' + date.getDate() : date.getDate()) + ' ';
        let h = (date.getHours() < 10 ? '0' + date.getHours() : date.getHours()) + ':';
        let m = (date.getMinutes() < 10 ? '0' + date.getMinutes() : date.getMinutes()) + ':';
        let s = (date.getSeconds() < 10 ? '0' + date.getSeconds() : date.getSeconds()); 
        return Y+M+D+h+m+s
    }