diff --git a/pages/category/category.js b/pages/category/category.js
index 10c3465..49f2ccb 100644
--- a/pages/category/category.js
+++ b/pages/category/category.js
@@ -24,7 +24,7 @@ Page({
     })
   },
 
-  bindShowProduct: function(e) {
+  bindTapProduct: function(e) {
     var that = this
     var cartItems = wx.getStorageSync('cartItems') || []
     var thisItem  = this.data.items.find(function(ele){
@@ -32,11 +32,11 @@ Page({
     })
 
     var exist = cartItems.find(function(ele){
-      return ele.id === that.data.id
+      return ele.id === thisItem.id
     })
 
     if (exist) {
-      exist.quantity = '1'
+      exist.quantity = parseInt(exist.quantity) + 1
     } else {
       cartItems.push({
         id: thisItem.id,
diff --git a/pages/category/category.wxml b/pages/category/category.wxml
index 1fd5929..2a2bdf2 100644
--- a/pages/category/category.wxml
+++ b/pages/category/category.wxml
@@ -1,7 +1,7 @@
 <scroll-view scroll-y="true" height="100%">
   <view class="item-container">
     <block wx:for="{{items}}" wx:for-item="item">
-      <view class="item" bindtap="bindShowProduct" data-id="{{item.id}}">
+      <view class="item" bindtap="bindTapProduct" data-id="{{item.id}}">
         <image class="head-img" src="{{item['image-url']}}" mode="scaleToFill"></image>    
         <view class="first-line">
           <text class="name">{{item.name}}</text>
diff --git a/pages/show_product/show_product.js b/pages/show_product/show_product.js
index de91fac..b19bbd8 100644
--- a/pages/show_product/show_product.js
+++ b/pages/show_product/show_product.js
@@ -34,7 +34,7 @@ Page({
     })
 
     if (exist) {
-      exist.quantity = this.data.quantity
+      exist.quantity = parseInt(exist.quantity) + 1
     } else {
       cartItems.push({
         id: this.data.id,