如何在moment.js中设置日期和时间

var date = "2017-03-13";
var time = "18:00";

var timeAndDate = moment(date + ' ' + time);

console.log(timeAndDate);

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.17.1/moment.min.js"></script>

let dateStr = '2017-03-13',
    timeStr = '18:00',
    date    = moment(dateStr),
    time    = moment(timeStr, 'HH:mm');

date.set({
    hour:   time.get('hour'),
    minute: time.get('minute'),
    second: time.get('second')
});

console.log(date);

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.17.1/moment.min.js"></script>