为评论和咨询切换绑定tap事件 --code reviewed by zhaobiao

@@ -10,7 +10,10 @@ var $ = require('jquery'),
 var commentsNum,consultsNum;
 
 var consultFooterEle = document.getElementById('consult-content-footer'),
-    consultFooterHammer = consultFooterEle && new Hammer(consultFooterEle);
+    consultFooterHammer = consultFooterEle && new Hammer(consultFooterEle),
+
+    navtabEle = document.getElementById('nav-tab'),
+    navtabHammer = navtabEle && new Hammer(navtabEle);
 
 
 (function() {
@@ -36,26 +39,29 @@ var consultFooterEle = document.getElementById('consult-content-footer'),
 
 })();
 
-$('#nav-tab li').on('touchend', function() {
-    var index = $(this).index();
+if (navtabHammer) {
+    navtabHammer.on('tap', function(e) {
+        var $this = $(e.target).closest('li');
+        var index = $this.index();
 
-    if ($(this).hasClass('comment-nav') && 0 === commentsNum) {
+        if ($this.hasClass('comment-nav') && 0 === commentsNum) {
             tip.show('暂无商品评价');
         } else {
-        if (!$(this).hasClass('focus')) {
+            if (!$this.hasClass('focus')) {
 
                 $('#nav-tab li').each(function() {
-                $(this).removeClass('focus');
+                    $this.removeClass('focus');
                 });
                 $('#feedback-content .content').each(function() {
-                $(this).addClass('hide');
+                    $this.addClass('hide');
                 });
 
-            $(this).addClass('focus');
+                $this.addClass('focus');
                 $('#feedback-content .content:eq(' + index + ')').removeClass('hide');
             }
         }
-});
+    });
+}
 
 if (consultFooterHammer) {
     consultFooterHammer.on('tap', function() {