如何把三位数的毫秒变为二位数的？
if(ms<1){
ms = "0"+ ms;
}
if(sec<10){
sec = "0" + sec;
}
if(min<10){
min = "0" + min;
}
if(hour<10){
hour = "0" + hour;
}
如何把每个单位的时间放在特定span上面？
var dd = ["J_TimeHour","J_TimeMin","J_TimeSec","J_TimeWSec"];
for (var i = 0; i< dd.length; i++) {
document.getElementById(dd[i]).innerHTML = ss[i];
} 
