text: import {
      ADD_COUNTER,
      ADD_TO_CART
  } from './mutation-types'
  export default  {
      addCart(context,payload) {
          //payload新添加的商品
          // let oldProduct = null;
          // for(let item of state.cartList){
          //     if(item.iid === payload.iid){
          //         oldProduct = item
          //     }
          // }
          return new Promise((resolve,reject)=>{
              // 1.查找之前数组中是否有该商品
              let oldProduct = context.state.cartList.find(item=>item.iid === payload.iid)
              // 2.判断oldProduct
              if(oldProduct) {
                  // oldProduct.count += 1
                  context.commit(ADD_COUNTER,oldProduct)
                  resolve('当前的商品数量+1')
              }else{
                  payload.count =1
                  // context.state.cartList.push(payload)
                  context.commit(ADD_TO_CART,payload)
                  resolve('添加了新商品')
              }
          })
      }
  }