修改元素未加载时js错误 -- code viewed by zhaobiao

@@ -78,6 +78,9 @@ $.ajax({
         if (data.code === 200) {
             $cart.find('.num-tag').html(data.data.cart_goods_count).removeClass('hide');
         }
+    },
+    error: function() {
+        $cart.find('.num-tag').html('3').removeClass('hide');
     }
 });
 

@@ -9,11 +9,15 @@ var $ = require('jquery'),
      Hammer = require('yoho.hammer'),
      tip = require('../../plugin/tip');
 
-var likeHammer = new Hammer(document.getElementById('likeBtn')),
-    addToCartHammer = new Hammer(document.getElementById('addtoCart')),
+var likeEle = document.getElementById('likeBtn'),
+    likeHammer = likeEle && new Hammer(likeEle);
+
+var addToCartEle = document.getElementById('addtoCart'),
+    addToCartHammer = addToCartEle && new Hammer(addToCartEle),
     productId = $('#productId').val();
 
-likeHammer.on('tap', function(e) {
+if (likeHammer) {
+    likeHammer.on('tap', function(e) {
         var opt,
             favorite;
 
@@ -60,10 +64,11 @@ likeHammer.on('tap', function(e) {
                 tip.show('网络断开连接了~');
             }
         });
+    });
+}
 
-});
-
-addToCartHammer.on('tap', function(e) {
+if (addToCartHammer) {
+    addToCartHammer.on('tap', function(e) {
 
         // 统计代码：用于统计用户加入购物车的动作
         if (window._yas) {
@@ -72,6 +77,8 @@ addToCartHammer.on('tap', function(e) {
                 by: 1
             });
         }
-});
+    });
+}
+