moment.js计算两个时间差值

minute为分钟，可更改为小时，秒或毫秒，具体看官方说明

 const m1 = moment(start)
    const m2 = moment(end)
    var duration = moment.duration(m2.diff(m1))
    var hours = duration.asHours();
    if (hours - 11.5 < 1) {
        hours = 0
    } else {
        hours -= 11.5
    }
    return Math.floor(hours)