微信小程序—满分食堂点餐小程序源码.zip

// pages/menu/menu.js Page({ data: { menumessage: {}, menuindex: "a0",//索引的序号 isleft: 0, isgoods: 0, //判断控制显示样式和满减的文字与价格 count: 0, //这里将写组件相关的属性 iscpn: false, translist: [], //单价:shopvalue，虚拟id:foods_id、总价:price、名字:name、数量:number tempdiscount: 0 }, onLoad: function () { const db = wx.cloud.database("") db.collection('List').get().then(res => { this.setData({ menumessage: res.data }) console.log("商品列表获取成功", res.data); }, () => { wx.showToast({ title: '数据请求错误', icon: 'error', duration: 500 }) }) }, orderJump(e) { this.setData({ menuindex: 'a' + e.currentTarget.dataset.list, isleft: e.currentTarget.dataset.list }) }, increaseShop(e) { var tempobj = {}; tempobj.name = this.data.menumessage[e.currentTarget.dataset.listfun].foods[e.currentTarget.dataset.foodsfun].specfoods[0].name; tempobj.price = this.data.menumessage[e.currentTarget.dataset.listfun].foods[e.currentTarget.dataset.foodsfun].specfoods[0].price;//商品的总价格 tempobj.shopvalue = this.data.menumessage[e.currentTarget.dataset.listfun].foods[e.currentTarget.dataset.foodsfun].specfoods[0].price;//商品的单价 tempobj.foods_id = this.data.menumessage[e.currentTarget.dataset.listfun].foods[e.currentTarget.dataset.foodsfun].virtual_food_id; tempobj.number = 1; this.seekNum(tempobj)//这里进行一步相同商品的判断 this.setData({ isgoods: (this.data.menumessage[e.currentTarget.dataset.listfun].foods[e.currentTarget.dataset.foodsfun].specfoods[0].price + this.data.isgoods) //商品的价格 }) if (this.data.isgoods > 25 && this.data.tempdiscount === 0) { //是否优惠3元 this.setData({ count: this.data.count + 1, //购物车的图标 isgoods: (this.data.isgoods - 3),//商品的价格 tempdiscount: 1, //只享受一次优惠 //传给组件的商品数据 translist: this.data.translist }) } else { this.setData({ count: this.data.count + 1, //购物车的图标 //传给组件的商品数据 translist: this.data.translist }) } }, handleCpn() { this.setData({ iscpn: !this.data.iscpn }) }, handleDelete() { this.setData({ count: 0, isgoods: 0, translist: [], iscpn: false }) }, handleReduce(event) { this.pageReduce(event.detail.cpnreduceid) }, handleAdd(event) { this.pageAdd(event.detail.cpnaddid) }, handleDefinite() { wx.navigateTo({ url: '/pages/submit/submit' }) }, //一些辅助函数,判断商品重复、去掉商品和添加商品 seekNum(obj) { if (this.data.translist.length !== 0) { const translength = this.data.translist.length; for (let i = 0; i < translength; ++i) { if (this.data.translist[i].foods_id === obj.foods_id) { this.data.translist[i].price += obj.price; ++this.data.translist[i].number return } else { if (i === translength - 1) this.data.translist.push(obj) } } } else { this.data.translist.push(obj) } }, pageReduce(tempreduceid) { const templength = this.data.translist.length; for (let j = 0; j < templength; j++) { if (this.data.translist[j].foods_id === tempreduceid) { --this.data.translist[j].number this.data.translist[j].price -= this.data.translist[j].shopvalue const tempvalue = this.data.translist[j].shopvalue; //取出来要删除的商品的单价 if (this.data.translist[j].number === 0) { //删除数组中的数据 this.cancleArray(j) this.setData({ translist: this.data.translist, count: this.data.count - 1, isgoods: this.data.isgoods - tempvalue }) if (this.data.translist.length === 0) { this.setData({ iscpn: !this.data.iscpn }) } } else { this.setData({ translist: this.data.translist, count: this.data.count - 1, isgoods: this.data.isgoods - tempvalue }) } return } } }, pageAdd(tempaddid) { const templength = this.data.translist.length; for (let m = 0; m < templength; m++) { if (this.data.translist[m].foods_id === tempaddid) { ++this.data.translist[m].number this.data.translist[m].price += this.data.translist[m].shopvalue this.setData({ translist: this.data.translist, count: this.data.count + 1, isgoods: this.data.isgoods + this.data.translist[m].shopvalue }) return } } }, cancleArray(n) { //删除translist数组中第n项的数据 if (n === 0) { this.data.translist.shift() } else { //数组进行向后的排序，删除最后一个元素。不考虑性能的情况下 for (let p = n + 1; p < this.data.translist.length; p++) { temparray = this.data.translist[n]; this.data.translist[n] = this.data.translist[p]; this.data.translist[p] = temparray; } this.data.translist.pop() } } })