购物车的实现，不是很清楚 json model 的格式

准备加入购买功能

app.js

@@ -1,10 +1,7 @@
 App({
   onLaunch: function () {
-    this.store = new(this.jsonApi())
-  },
-
-  jsonApi: function() {
-    const jsonApi = require('node_modules/jsonapi-datastore/dist/jsonapi-datastore.js').JsonApiDataStore
-    return jsonApi
+    const jsonApi = require('node_modules/jsonapi-datastore/dist/jsonapi-datastore.js')
+    this.store = new(jsonApi.JsonApiDataStore)
+    this.jsonModel = jsonApi.JsonApiDataStoreModel
   }
-})
+})

pages/cart/cart.js

@@ -3,5 +3,11 @@ Page({
 
   onLoad: function() {
     var that = this
+  },
+
+  bindBilling (e) {
+    var cartItems = wx.getStorageSync('cartItems') || []
+    
+    
   }
 })

pages/show_product/show_product.js

@@ -33,11 +33,24 @@ Page({
   },
 
   bindAddToCart (e) {
-    //var existItem = wx.getStorageSync('cartItems')
-    // TODO
+    var cartItems = wx.getStorageSync('cartItems') || {data:[]}
+
+    var exist = cartItems.data.find(function(ele){
+      return ele.id === app.getCurrentPage().data.id
+    })
+
+    if (exist) {
+      exist.quantity = this.data.quantity
+    } else {
+      var model = getApp().jsonModel
+      var product = new model('product', this.data.id)
+      product.setAttribute('quantity', this.data.quantity)
+      cartItems.data.push(product)
+    }
+
     wx.setStorage({
-      key: `cart-${this.data.id}`,
-      data: {quantity: this.data.quantity}
+      key: 'cartItems',
+      data: cartItems
     })
   },
 

utils/product.js

@@ -35,9 +35,23 @@ function getSlides () {
   })
 }
 
+function postBilling (data) {
+  return new Promise((resolve, reject) => {
+    wx.request({
+      method: 'POST',
+      url: `${API_URL}/cart/billing`,
+      data: data,
+      header: { 'Content-Type': 'application/json'},
+      success: resolve,
+      fail: reject
+    })
+  })
+}
+    
+
 module.exports = {
-  getProducts (data) {
-    return getProducts(data)
+  getProducts () {
+    return getProducts()
   },
   getProduct (data) {
     return getProducts(data)
@@ -45,5 +59,9 @@ module.exports = {
 
   getSlides () {
     return getSlides()
+  },
+
+  postBilling (data) {
+    return postBilling(data)
   }
 }