fix 秒杀 ajax cache

@@ -230,6 +230,7 @@ seckillObj = {
             '/product/seckill/get-product-list';
 
         loading.show();
+        self.el.$navList.toggleClass('fix-top', false);
         $.ajax({
             url: url,
             data: {
@@ -299,7 +300,10 @@ seckillObj = {
     bindEvents: function() {
         var self = this;
         var $nav = self.el.$navList;
-        var top = $nav.position().top + $nav.height();
+        var h = $nav.height();
+        var top = $nav.position().top + h;
+
+        $nav.wrap('<div style="height:' + h + 'px;"></div>');
 
         if (yoho.isApp) {
             this.$productList.on('click', '[data-remind]', $.proxy(this.toggleRemind, this));
@@ -392,7 +396,10 @@ seckillObj = {
         var $xhr;
 
         loading.show();
-        $xhr = $.get(location.href)
+        $xhr = $.ajax({
+            url: location.href,
+            cache: false
+        })
             .done(function(result) {
                 self.$container.replaceWith(
                     self.pageTemplate($.extend(result, {