js计时器

<script language="javascript">var se,m=0,h=0,s=0,ss=1;function second(){if((ss%100)==0){s+=1;ss=1;}if(s>0 && (s%60)==0){m+=1;s=0;}if(m>0 && (m%60)==0){h+=1;m=0;}t=h+"时"+m+"分"+s+"秒"+ss+"毫秒";document.getElementById("showtime").value=t;ss+=1;}function startclock(){se=setInterval("second()",1);}function pauseclock(){clearInterval(se);}function stopclock(){clearInterval(se);ss=1;m=h=s=0;}</script><input name="s" type="button" value="开始计时" onclick="startclock()"><input name="s" type="button" value="暂停计时" onclick="pauseclock()"><input name="s" type="button" value="停止计时" onclick="stopclock()"><input name="showtime" style="color:#ff0000;width:200px;" id="showtime" type="text" value="0时0分0秒">