获取某一天某个时刻的具体时间戳

function getTargetTime(t){
      var d = t.split(" ")[0],
        h = t.split(" ")[1],
        date = new Date()

    date.setYear(d.split("-")[0])
    date.setMonth(d.split("-")[1] - 1)
    date.setDate(d.split("-")[2])

    date.setHours(h.split(":")[0])
    date.setMinutes(h.split(":")[1])
    date.setSeconds(h.split(":")[2])
    
    return date.getTime()    
}

//例：
getTargetTime('2020-03-04 15:10:00')