购物车修改

@@ -3,7 +3,8 @@
  * @author: xuqi<qi.xu@yoho.cn>
  * @date: 2015/10/21
  */
-var $ = require('jquery');
+var $ = require('jquery'),
+    Hammer = require('yoho.hammer');
 
 var $footer = $('#yoho-footer'),
     $yohoPage = $('.yoho-page'),
@@ -155,6 +156,15 @@ function reMarginFooter(fixedElement) {
         $(window).scrollTop(0);
         return false;
     });
+
+    if ($op.find('.back-to-top').length > 0) {
+        navHammer = new Hammer(document.getElementsByClassName('back-to-top')[0]);
+        navHammer.on('tap', function(e) {
+            $(window).scrollTop(0);
+            return false;
+        });
+    }
+
     $footer.removeClass('hide');
 }());