购物车修改 code review by zhaobiao

@@ -310,7 +310,6 @@ $yohoPage.on('touchstart', '.btn-minus', function() {
 
         promotionId,
         isEdit = 0,
-        numInCart = $('.num-tag').html() - 0,
         num = parseInt($num.val(), 10);
 
     //颜色尺码没有选择
@@ -322,7 +321,6 @@ $yohoPage.on('touchstart', '.btn-minus', function() {
         return;
     }
 
-
     //TODO status change
     if ($('#chose-btn-sure').html() === '已售罄') {
         return;