Function onLoad

pages/cart/cart.js:11–39

()

    totalCounter: 0
  },
  onLoad() {
    // 1.第一次加载数据
    this.setData({
      cartList: app.globalData.cartList
    })

    // 2.设置回调
    app.addCartCallback = () => {
      this.setData({
        cartList: app.globalData.cartList
      })
      this.changeData()
    }

    // 3.设置修改某个商品的回调
    app.changeGoodsState = (index, goods) => {
      // 1.修改某一项的选中状态
      this.setData({
        [`cartList[${index}]`]: goods
      })

      // 2.修改全部选中的状态
      const selectAll = !this.data.cartList.find(item => !item.checked)
      this.setData({
        isSelectAll: selectAll
      })
      this.changeData()
    }
  },
  onShow() {
    wx.setNavigationBarTitle({
      title: `购物车(${this.data.cartList.length})`,