text: import {ADD_COUNTER,ADD_TO_CART} from './mutation-types.js'
  
  export default {
    addCart(context,payload) {
      return new Promise((resolve,reject) => {
        //查找数组中是否有该商品
        let oldProduct = context.state.cartList.find(item => item.iid === payload.iid)
  
        //判断oldProduct
        if(oldProduct) {//商品数量加1
          context.commit(ADD_COUNTER,oldProduct)
          resolve('当前商品数量+1')
        } else {//添加新的商品
          payload.count = 1
          context.commit(ADD_TO_CART,payload)
          resolve('添加到购物车')
        }
      })
    }
  }
  