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');
     }
 });
 

@@ -9,69 +9,76 @@ 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) {
-    var opt,
-        favorite;
+if (likeHammer) {
+    likeHammer.on('tap', function(e) {
+        var opt,
+            favorite;
 
-    var $this = $(e.target);
+        var $this = $(e.target);
 
-    if ($this.hasClass('liked')) {
-        opt = 'cancel';
-        favorite = 0;
-    } else {
-        opt = 'ok';
-        favorite = 1;
-    }
-    $.ajax({
-        type: 'POST',
-        url: '/product/opt/favoriteProduct',
-        data: {
-            id: productId,
-            opt: opt
-        },
-        success: function(data) {
-            if (data.code === 200) {
-                $this.toggleClass('liked');
+        if ($this.hasClass('liked')) {
+            opt = 'cancel';
+            favorite = 0;
+        } else {
+            opt = 'ok';
+            favorite = 1;
+        }
+        $.ajax({
+            type: 'POST',
+            url: '/product/opt/favoriteProduct',
+            data: {
+                id: productId,
+                opt: opt
+            },
+            success: function(data) {
+                if (data.code === 200) {
+                    $this.toggleClass('liked');
 
-                if ('cancel' === opt) {
-                    tip.show('取消收藏成功');
-                } else if ('ok' === opt) {
-                    tip.show('收藏成功');
+                    if ('cancel' === opt) {
+                        tip.show('取消收藏成功');
+                    } else if ('ok' === opt) {
+                        tip.show('收藏成功');
+                    }
+                } else if (data.code === 400) {
+                    location.href = data.data;//未登录跳转登录页
+                } else {
+                    tip.show(data.message);
                 }
-            } else if (data.code === 400) {
-                location.href = data.data;//未登录跳转登录页
-            } else {
-                tip.show(data.message);
-            }
 
-            // 统计代码：用于统计用户加入或取消商品收藏的动作
-            if (window._yas) {
-                window._yas.sendCustomInfo({
-                    pd: productId,
-                    fa: favorite
-                });
+                // 统计代码：用于统计用户加入或取消商品收藏的动作
+                if (window._yas) {
+                    window._yas.sendCustomInfo({
+                        pd: productId,
+                        fa: favorite
+                    });
+                }
+            },
+            error: function() {
+                tip.show('网络断开连接了~');
             }
-        },
-        error: function() {
-            tip.show('网络断开连接了~');
-        }
+        });
     });
+}
 
-});
+if (addToCartHammer) {
+    addToCartHammer.on('tap', function(e) {
 
-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) {
+            window._yas.sendCustomInfo({
+                pd: productId,
+                by: 1
+            });
+        }
+    });
+}
 
-    // 统计代码：用于统计用户加入购物车的动作
-    if (window._yas) {
-        window._yas.sendCustomInfo({
-            pd: productId,
-            by: 1
-        });
-    }
-});