var timerID = null
var timerRunning = false
function stopclock(){
    if(timerRunning)
        clearTimeout(timerID)
    timerRunning = false
}
function startclock(){
    stopclock()
    showtime()
}
function showtime(){
    var now = new Date()
    var hours = now.getHours()
    var minutes = now.getMinutes()
    var seconds = now.getSeconds()
    var timeValue = "" + ((hours > 12) ? hours - 12 : hours)
    timeValue  += ((minutes < 10) ? ":0" : ":") + minutes
    timeValue  += ((seconds < 10) ? ":0" : ":") + seconds
    if (hours>=6 && hours<=12)
       {timeValue  += ("上午")}
    if(hours>12 && hours<=18) 
       {timeValue += ("下午")}
    if(hours>18 && hours <=24)
       {timeValue +=("晚上")}
    if(hours<6) 
       {timeValue += ("深夜")}
    document.getElementById('face').value = timeValue 
    timerID = setTimeout("showtime()",1000)
    timerRunning = true
}