PHP精确到毫秒秒杀倒计时实例

 1 // 注意：php的时间是以秒算。js的时间以毫秒算 
 2 // 设置时区 
 3 date_default_timezone_set(\'PRC\'); 
 4 //配置每天的活动时间段 
 5 $starttimestr = date(\'Y-m-d H:i:s\', strtotime(date(\'Y-m-d\'))); 
 6 $endtimestr = date(\'Y-m-d H:i:s\', strtotime(date(\'Y-m-d\', strtotime(\'+1 day\')))); 
 7 $starttime = strtotime($starttimestr); 
 8 $endtime = strtotime($endtimestr); 
 9 $nowtime = time(); 
10 if ($nowtime < $starttime) { 
11     exit(\"活动还没开始,活动时间是：{$starttimestr}至{$endtimestr}\"); 
12 } 
13 if ($endtime >= $nowtime) { 
14     $lefttime = $endtime - $nowtime; //实际剩下的时间（秒） 
15 } else { 
16     $lefttime = 0; 
17     exit(\"活动已经结束！\"); 
18 }

 1 var runtimes = 0; 
 2 function GetRTime() { 
 3     var lefttime = < ?php echo $lefttime; ? > * 1000 - runtimes * 1000; 
 4             if (lefttime >= 0) { 
 5         var nD = Math.floor(lefttime / (1000 * 60 * 60 * 24)) % 24; 
 6         var nH = Math.floor(lefttime / (1000 * 60 * 60)) % 24; 
 7         var nM = Math.floor(lefttime / (1000 * 60)) % 60; 
 8         var nS = Math.floor(lefttime / 1000) % 60; 
 9         document.getElementById(\"RemainD\").innerHTML = nD; 
10         document.getElementById(\"RemainH\").innerHTML = nH; 
11         document.getElementById(\"RemainM\").innerHTML = nM; 
12         document.getElementById(\"RemainS\").innerHTML = nS; 
13         if (lefttime == 5 * 60 * 1000) { 
14             alert(\"还有最后五分钟！\"); 
15         } 
16         runtimes++; 
17         setTimeout(\"GetRTime()\", 1000); 
18     } else { 
19         alert(\'活动结束了！\'); 
20         location.reload(); 
21     } 
22 } 
23 var Num = 0; 
24   = function() { 
25     Refresh(); 
26     setInterval(\"Refresh();\", 100); 
27     GetRTime(); 
28 } 
29 function Refresh() { 
30     if (Num < 10) { 
31         document.getElementById(\"RemainL\").innerHTML = Num; 
32         Num = Num + 1; 
33     } else { 
34         Num = 0; 
35     } 
36 }