text: import {
    ADD_COUNTER,
    ADD_CART
  } from './mutation-types'
  export default {
    addToCart(context, payload) {
      return new Promise(((resolve, reject) => {
        let oldProduct = context.state.cartList.find(item => item.iid === payload.iid)
        if(oldProduct) {
          context.commit(ADD_COUNTER, oldProduct)
          resolve('商品数量+1')
        }else {
          payload.count = 1
          context.commit(ADD_CART, payload)
          resolve('添加购物车成功')
        }
      }))
    }
  }
  