Merge branch 'develop' of http://git.dev.yoho.cn/web/yohobuy into develop

@@ -10,6 +10,8 @@ var $footer = $('#yoho-footer'),
     $yohoPage = $('.yoho-page'),
     $header = $('.yoho-header');
 
+var backToTopHammer;
+
 function cookie(name) {
     var cookies = document.cookie,
         cookieVal,
@@ -158,6 +160,15 @@ function reMarginFooter(fixedElement) {
         e.srcEvent.preventDefault();
         return false;
     });
+
+    if ($op.find('.back-to-top').length > 0) {
+        backToTopHammer = new Hammer(document.getElementsByClassName('back-to-top')[0]);
+        backToTopHammer.on('tap', function(e) {
+            $(window).scrollTop(0);
+            return false;
+        });
+    }
+
     $footer.removeClass('hide');
 }());
 

@@ -20,12 +20,12 @@
             {{#if cartNav}}
                 <ul class="cart-nav clearfix">
                     <li class="active">
-                        <span>
+                        <span id="common-cart-nav">
                             普通商品({{commonGoodsCount}})
                         </span>
                     </li>
                     <li>
-                        <span>
+                        <span id="presell-cart-nav">
                             预售商品({{presellGoodsCount}})
                         </span>
                         <div id="presell-tip" class="presell-tip">