小程序外卖订单界面的示例代码

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1.效果界面

2.涉及功能

*左侧商品类型、右侧商品可以相互控制；
*商品列表加减及购物车商品加减icon消失、显示；
*商品每一次加减，页面视图变化（数量、价格变化、购物车置灰）；

3.贴上所有代码

1.wxml   

            {{item.name}}                        {{item.name}}                            {{itm.title}}        {{itm.info}}        ¥{{itm.price}}                                                                                                 {{totalNum}}        ¥{{totalMoney}}      去结算                  已选商品     清空                          {{item.name}}               ¥{{item.price}}                                                                                          {{goodDetail.title}}     ¥{{goodDetail.price}}     {{goodDetail.info}}              

2.script

createPage({ data: {  foodsList: [], // 商品数据  cartList: [], // 购物车数据  isShowCartMask: false,  totalNum: 0,  totalMoney: 0,  initView: 'item0', // 根据此变量的变化，控制左侧选中状态、右侧滑动  curId: 'item0',  isShowDetail: false,  goodDetail: {},  screenWidth: 0, // 手机屏幕宽度  heightArray: [0] // 右侧每一个类型的高度区间数组 }, onLoad() {  this.getGoodsData() }, methods: {  async getGoodsData() {   const that = this   const res = await getGoodsInfo({})   this.foodsList = res   wx.getSystemInfo({    success: (ress) => {     that.screenWidth = ress.windowWidth    }   })   this.getHeightSection()  },  // 设置高度区间 所有单位转化为rpx  getHeightSection() {   const that = this   let hg = 0   for (let index = 0; index < that.foodsList.length - 1; index++) {    hg += 70 + that.foodsList[index].list.length * 212    that.heightArray.push(hg)   }  },  // 获取高度区间的下标  getHeightIndex(arr, hg) {   const that = this   arr.forEach((item, index) => {    if (hg >= item) {     that.setData({      curId: 'item' + index     })    }   })  },  // 左边菜单控制右边  scrollToViewFn(e) {   this.setData({    initView: e.target.dataset.id,    curId: e.target.dataset.id   })  },  // 右边滚动控制左边  onPageScroll(e) {   const that = this   let scrollTop = e.detail.scrollTop * 750 / that.screenWidth   this.getHeightIndex(that.heightArray, scrollTop)  },  // 商品列表的减号点击  reduceNum(index, ind, item) {   const that = this   let val = 'foodsList[' + index + '].list[' + ind + '].num'   this.setData({    [val]: item.num - 1   })   // 如果商品为0，就把当前商品在购物车清除   // 如果不为0， 就将当前商品数量减1   if (that.foodsList[index].list[ind].num === 0) {    that.removeAarry(that.cartList, item.id)   } else {    that.cartList.forEach((itm, i) => {     if (itm.id === item.id) {      let value = 'cartList[' + i + '].num'      that.setData({       [value]: itm.num - 1      })     }    })   }   this.computed()  },  // 商品列表的加号点击  addNum(index, ind, item) {   const that = this   let val = 'foodsList[' + index + '].list[' + ind + '].num'   this.setData({    [val]: item.num + 1   })   // 如果商品为1，就把当前商品加入购物车   // 否则， 就将当前商品数量加1   if (that.foodsList[index].list[ind].num === 1) {    let val = { id: item.id, name: item.title, price: item.price, num: 1, index: index, ind: ind, pic: item.pic }    that.cartList.push(val)   } else {    that.cartList.forEach((itm, i) => {     if (itm.id === item.id) {      let value = 'cartList[' + i + '].num'      that.setData({       [value]: itm.num + 1      })     }    })   }   this.computed()  },  // 购物车的减号点击  reduceCart(index, item) {   const that = this   let val = 'foodsList[' + item.index + '].list[' + item.ind + '].num'   let val1 = 'cartList[' + index + '].num'   this.setData({    [val]: item.num - 1,    [val1]: item.num - 1   })   // 如果商品为0，就把当前商品在购物车清除   // 如果不为0， 就将当前商品数量减1   if (that.cartList[index].num === 0) {    that.removeAarry(that.cartList, item.id)   }   this.computed()  },  // 购物车的加号点击  addCart(index, item) {   const that = this   let val = 'cartList[' + index + '].num'   that.setData({    [val]: item.num + 1   })   this.computed()  },  // 清空购物车  clearCart() {   const that = this   wx.showModal({    title: '提示',    content: '清空购物车？',    success: function (res) {     if (res.confirm) {      that.setData({       cartList: []      })      that.foodsList.forEach((item, i) => {       item.list.forEach((itm, j) => {        let value = 'foodsList[' + i + '].list[' + j + '].num'        that.setData({         [value]: 0        })       })      })      that.computed()     }    }   })  },  // 计算选择商品总价格和总数量  computed() {   const that = this   let num = 0   let money = 0   that.cartList.forEach(item => {    num += item.num    money += parseFloat(item.price) * item.num   })   that.setData({    totalNum: num,    totalMoney: money   })  },  // 将数量为0的时候，对应商品在购物车中删除  removeAarry(arr, id) {   arr.forEach((item, index) => {    if (item.id === id) {     arr.splice(index, 1)    }   })   return arr  },  showCartMask() {   this.isShowCartMask = !this.isShowCartMask  },  hiddenCartMak() {   this.isShowCartMask = false  },  stopMaopao() {  },  showGoodDetail(item) {   this.goodDetail = item   this.isShowDetail = true  },  hideDetail() {   this.isShowDetail = false  },  // 订单提交  submitOrder() {  } }})

3.css