function show_time(){
var time_now = new Date(); // 获取当前时间
time_now = time_now.getTime();
var time_distance = time_end - time_now; // 结束时间减去当前时间
var int_day,int_hour,int_minute,int_second;
if(time_distance >= 0){
// 天时分秒换算
int_day = Math.floor(time_distance/86400000)
time_distance -= int_day 86400000;
int_hour = Math.floor(time_distance/3600000)
time_distance -= int_hour 3600000;
int_minute = Math.floor(time_distance/60000)
time_distance -= int_minute * 60000;
int_second = Math.floor(time_distance/1000)

// 时分秒为单数时、前面加零站位
if(int_hour < 10)
int_hour = "0" + int_hour;
if(int_minute < 10)
int_minute = "0" + int_minute;
if(int_second < 10)
int_second = "0" + int_second;

// 显示时间
time_d.innerHTML = int_day;
time_h.innerHTML = int_hour;
time_m.innerHTML = int_minute;
time_s.innerHTML = int_second;

setTimeout("show_time()",1000);
}else{
time_d.innerHTML = time_d.innerHTML;
time_h.innerHTML = time_h.innerHTML;
time_m.innerHTML = time_m.innerHTML;
time_s.innerHTML = time_s.innerHTML;

// clearTimeout(timerID)
}
};