wx-teacher/pages/shoppingcart/shoppingcart.js

Page({
  data: {
    cartItems: [
      {
        id: '1',
        image: 'https://img1.baidu.com/it/u=2052658756,3021621759&fm=253&fmt=auto&app=120&f=JPEG?w=500&h=500',
        title: '幼儿启蒙绘本 10册套装',
        description: '适合3-6岁儿童，培养创造力',
        price: 134.00,
        quantity: 1,
        checked: true
      },
      {
        id: '2',
        image: 'https://img1.baidu.com/it/u=2052658756,3021621759&fm=253&fmt=auto&app=120&f=JPEG?w=500&h=500',
        title: '幼儿启蒙绘本 10册套装',
        description: '适合3-6岁儿童，培养创造力',
        price: 134.00,
        quantity: 1,
        checked: true
      }
    ],
    souimg: '',
  },

  onShow() {
    if (typeof this.getTabBar === 'function' && this.getTabBar()) {
      this.getTabBar().setSelected(2); // 比如首页就是 0
    }
  },

  onLoad() {
    this.updateTotalPrice();

    const fileIDs = [
      'cloud://cloud1-6g98iw7i28b01747.636c-cloud1-6g98iw7i28b01747-1367995226/images/icon/sou.png',
    ];
    
    // 并发下载多个 fileID
    Promise.all(
      fileIDs.map(fileID => wx.cloud.downloadFile({ fileID }))
    ).then(results => {
      // 每个 result 对应一个下载结果
      const tempFilePaths = results.map(r => r.tempFilePath);
      console.log('全部下载成功:', tempFilePaths);
      this.setData({
        souimg: tempFilePaths[0],
      });
    }).catch(err => {
      console.error('有文件下载失败:', err);
    });
  },

  handleCheckboxChange(e) {
    const { value } = e.detail;
    const cartItems = this.data.cartItems.map(item => ({
      ...item,
      checked: value.includes(item.id)
    }));
    this.setData({ cartItems });
    this.updateTotalPrice();
  },

  handleAllCheckboxChange(e) {
    const { value } = e.detail;
    const allChecked = value.includes('all');
    const cartItems = this.data.cartItems.map(item => ({
      ...item,
      checked: allChecked
    }));
    this.setData({ cartItems, allChecked });
    this.updateTotalPrice();
  },

  updateTotalPrice() {
    const totalPrice = this.data.cartItems.reduce((total, item) => {
      if (item.checked) {
        return total + item.price * item.quantity;
      }
      return total;
    }, 0);
    this.setData({ totalPrice });
  },

  handleCheckout() {
    // 处理结算逻辑
    console.log('结算');
  },
  

  onChange(e) {
    const { id } = e.currentTarget.dataset;
    const { detail } = e;
    const cartItems = this.data.cartItems.map(item => {
      if (item.id === id) {
        return { ...item, quantity: detail };
      }
      return item;
    });
  
    this.setData({ cartItems }, () => {
      this.updateTotalPrice();
    });
  }
});