修复秒杀倒计时 切到后台时暂时的问题

@@ -238,27 +238,31 @@ seckillObj = {
             time = $(elem).find('input.date').val() / 1000;
             time = $(elem).find('input.date').val() / 1000;
         }
         }
         offsetTime = time - nowTime;
         offsetTime = time - nowTime;
-        that.startTick(elem, offsetTime);
+        that.startTick(elem, offsetTime, nowTime);
     },
     },
 
 
     /**
     /**
      * [开始倒计时]
      * [开始倒计时]
      */
      */
-    startTick: function(elem, offsetTime) {
+    startTick: function(elem, offsetTime, nowTime) {
         var that = this,
         var that = this,
             $el = this.el,
             $el = this.el,
             hour = parseInt(offsetTime / (60 * 60), 10),
             hour = parseInt(offsetTime / (60 * 60), 10),
             minute = parseInt(offsetTime % (60 * 60) / 60, 10),
             minute = parseInt(offsetTime % (60 * 60) / 60, 10),
             second = offsetTime % 60;
             second = offsetTime % 60;
 
 
-        $(elem).find('.tick.hour').text(hour < 0 ? '00' : (hour < 10 ? ('0' + hour) : hour));
-        $(elem).find('.tick.minute').text(minute < 0 ? '00' : (minute < 10 ? ('0' + minute) : minute));
-        $(elem).find('.tick.second').text(second < 0 ? '00' : (second < 10 ? ('0' + second) : second));
         if (offsetTime <= 0) { // 结束倒计时刷新状态
         if (offsetTime <= 0) { // 结束倒计时刷新状态
             that.refreshList(elem);
             that.refreshList(elem);
         } else {
         } else {
+            $(elem).find('.tick.hour').text(hour < 0 ? '00' : (hour < 10 ? ('0' + hour) : hour));
+            $(elem).find('.tick.minute').text(minute < 0 ? '00' : (minute < 10 ? ('0' + minute) : minute));
+            $(elem).find('.tick.second').text(second < 0 ? '00' : (second < 10 ? ('0' + second) : second));
+
             $el.currentTick = setTimeout(function() {
             $el.currentTick = setTimeout(function() {
-                that.startTick(elem, --offsetTime);
+                var curSec = Math.floor(Date.now() / 1000);
+
+                offsetTime = offsetTime - (curSec - nowTime);
+                that.startTick(elem, offsetTime, curSec);
             }, 1000);
             }, 1000);
         }
         }
     },
     },