优化订单倒倒计时JS逻辑

Signed-off-by: 🍓 <lixia.zhang@yoho.cn>

@@ -45,8 +45,8 @@ function downCount(options) {
             // set new Date object
             return utc;
         },
-
-        difference = targetDateFunction() - currentDateFunction();// difference of dates
+        difference = targetDateFunction() - currentDateFunction(),// difference of dates
+        interval;
 
     // Throw error if date is not set
     if (!settings) {
@@ -68,11 +68,10 @@ function downCount(options) {
             _minute = _second * 60,
             _hour = _minute * 60,
             _day = _hour * 24,
-            interval,
             days,
             hours,
             minutes,
-            seconds;        
+            seconds;
 
         // calculate dates
         days = Math.floor(difference / _day),
@@ -97,7 +96,6 @@ function downCount(options) {
             return;
         }
     }
-    countdown();
     interval = setInterval(countdown, 1000);// start
 }