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

- Subproject commit e9d066dd88a8e7e37103021c427a205a5cfcdcec
+ Subproject commit 75bbc3b075de19f239532f60c5995d06c5f814e2

@@ -10,8 +10,6 @@ var $footer = $('#yoho-footer'),
     $yohoPage = $('.yoho-page'),
     $header = $('.yoho-header');
 
-var backToTopHammer;
-
 function cookie(name) {
     var cookies = document.cookie,
         cookieVal,
@@ -134,6 +132,8 @@ function reMarginFooter(fixedElement) {
 
     var user = getUser();
 
+    var backToTopHammer;
+
     rePosFooter(); //计算底部位置
 
     if (user === 0) {
@@ -154,15 +154,11 @@ function reMarginFooter(fixedElement) {
         );
     }
 
-    $op.find('.back-to-top').on('touchend', function() {
-        $(window).scrollTop(0);
-        return false;
-    });
-
     if ($op.find('.back-to-top').length > 0) {
-        backToTopHammer = new Hammer(document.getElementsByClassName('back-to-top')[0]);
+        backToTopHammer = new Hammer($op.find('.back-to-top')[0]);
         backToTopHammer.on('tap', function(e) {
             $(window).scrollTop(0);
+            e.srcEvent.preventDefault();
             return false;
         });
     }

@@ -15,7 +15,7 @@ function downLoadApp() {
     var appUrl = 'http://a.app.qq.com/o/simple.jsp?pkgname=com.yoho&g_f=995445';
     var clickedAt = new Date();
 
-    setTimeout(function () {
+    setTimeout(function() {
         if ((new Date()) - clickedAt < 2000) {
             window.location = appUrl;
         }