秒表

<spam id="time"></spam>
<script>

        function getDate(){
            var objTime=new Date();
            var hour=objTime.getHours();
            var minute=objTime.getMinutes();
            var second=objTime.getSeconds();
            if(hour<10){
                hour= '0'+hour;
            }
            if(minute<10){
                minute='0'+minute;
            }
            if(second<10){
                second='0'+second;
            }
            var str=hour+':'+minute+':'+second;
            document.getElementById('time').innerHTML=str;
        }
        getDate()
        var setTime=setInterval(function(){
            getDate();
        },1000)
</script>