微信小程序商城开发之实现商品加入购物车的功能（代码）

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看效果

购物车.gif

开发计划

1、商品详情页将商品信息放入缓存2、购物车页面读取缓存获取商品信息3、购物车商品计算和删除缓存商品

一、商品详情页将商品信息放入缓存

detail.wxml<button data-goodid="{{goods.goodsId}}">绑定bindtap事件将商品加入购物车。

detail.js/*** 加入购物车*/addCar: function (e) {var goods = this.data.goods;goods.isSelect=false;var count = this.data.goods.count;var title = this.data.goods.title;if (title.length > 13) {goods.title = title.substring(0, 13) + '...';}// 获取购物车的缓存数组（没有数据，则赋予一个空数组）var arr = wx.getStorageSync('cart') || [];console.log("arr,{}", arr);if (arr.length > 0) {// 遍历购物车数组for (var j in arr) {// 判断购物车内的item的id，和事件传递过来的id，是否相等if (arr[j].goodsId == goodsId) {// 相等的话，给count+1（即再次添加入购物车，数量+1）arr[j].count = arr[j].count + 1;// 最后，把购物车数据，存放入缓存（此处不用再给购物车数组push元素进去，因为这个是购物车有的，直接更新当前数组即可）try {wx.setStorageSync('cart', arr)} catch (e) {console.log(e)}//关闭窗口wx.showToast({title: '加入购物车成功！',icon: 'success',duration: 2000});this.closeDialog();// 返回（在if内使用return，跳出循环节约运算，节约性能）return;}}// 遍历完购物车后，没有对应的item项，把goodslist的当前项放入购物车数组arr.push(goods);} else {arr.push(goods);}// 最后，把购物车数据，存放入缓存try {wx.setStorageSync('cart', arr)// 返回（在if内使用return，跳出循环节约运算，节约性能）//关闭窗口wx.showToast({title: '加入购物车成功！',icon: 'success',duration: 2000});this.closeDialog();return;} catch (e) {console.log(e)}}二、购物车页面读取缓存获取商品信息

cart.wxml<view>cart.wxss @import "../template/template.wxss"; page{background: #f3f4f5;/* font-size: 37.5px;*/}.column image {width:33rpx;height:35rpx;display:inline-block;overflow:hidden;float:right;margin-top: -40rpx;margin-left:400rpx;}.J-shopping-cart-empty{margin: 0;padding: 0;border: 0;font: inherit;font-size: 100%;vertical-align: baseline;}.shopping-cart-empty {height: 250px;padding-top: 3.2rem;padding-bottom: 1.6rem;background-color: #fff;text-align: center;position: relative;} .shopping-cart-empty .bg{position: absolute;width: 16.29333rem;height: 6.73333rem;background: transparent url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAm0AAAEXAQMAAADFlOHHAAAABlBMVEUAAAAAAAClZ7nPAAAAAnRSTlMAFRtOKdMAAArmSURBVHja5ZxNiBzHFcf/b2pcvUSt6UkOoYWG7RUE5+LgXtvIIzTsrGXIIST3HAxuWSbxYSEjCI4CiqY2MrIPSywiQhRyiHwLIQdBgiNwcMpswDYoiQkEBDa4iME5ug0JjM1oKofdmf6q7Z7proAgfezp+fXrV69evffqA/jfX5es0tjEKs57xSrusmv1W5VVXIDLNnET9rFFmiMDbhG3hUnLIi52JLP4rWILFnHrFNvEXXJuw7Fnw3Lgo2Ovv1LsomevvzrCRWiLRmoLHJE9M5miBWmtS7C7YGQNF6+7IBK2VCcvuaCr1hr2LeUC16zh3hZt4K49s0Mb+KY13Ajc5jAb2cWF4MDIIq6F2l12VrjTBauN83Thlp/BUXHQBJyjuuD4X4XeFMwI2Fg4hNzr3zvA0dToPTQTRYE/FQmuk//D/XcA/qE2RljjmBn6+o9E4u76ud+O6U+0nunPzcLhogHnyUS6osV8ovXMrLth7F6UJqeykI5U4dcdwDG6L6bFugmH0UI6gy4uA951o3ATdIxut7/AeQbTUqSnZuHgOsrwS2+B6wEQy+GCCYArJhxftEC/gDt+I6IbOyYrkQBTJpyzaAEF5Aa1429E9MaO0U8CQ+OAyuZNR0XckR+rABYbXRG9Oef2C7jObxT94xkzbmj2bBTP/9sr4FxEJFwjjuIjHOVc+z13FVwgKjxbny+Pi2iS9PGWNnWcEQOwvRxu5IkEp7XJYiImlsdNEw80/tyoREkCOVM6EjeW8BR8AHBmSWumW1hALo0bAOPJQdQ6FghuN8T1QXqGHgCagGaGJiYgWgHH4kD0ADgCQ2XAsVVwPpxX35YdAD08OkNTXA/e4DPVARBoLdE14jYwXhq3HrmHuLg4Zh3gQkfHy+J6ko84gLUjSh0EhEHOII/EuTgj2MgB4AJg94yGEl7KKdVlisTAgOvgLOjOHLfVM46QocrjHEViasQ9BsxxjgqmJqdzRuRwvhvR7l0j7kXgJjvAzXDf4FNGCPIurO9HjPaM49WLwAdMAJ1vaOnsGUb8AXgeN/KjDmubxit8/xDn6Fu47BpGIY9kHqe6kcvco3DPMAFwwFN9Q79gOs7hSIZRnx+J+4AkwOFMMDGNkbNBDsdEqMKWCcfEi4e4QN+Hp6CMxpnFOQil4v5RuJskgSu/FtAwRj88FdgemMMJIVnfiHsMuAMJ+hgIYnPUxnMexcVJEsw4OIuzoDtQcK7iUQ2sG2PAHM5Hh4nEpFrpRjoDFkKhx7RWwMTQx8BEdpwNhMviRC08/XRP8BEU+qTfAwyRXgxAZnFnpc8mSUyawa1HrkJ0+DXD4pdOAYyyeXyoQuY6qZZJ8hjpDX6oMDrAmWqxYwBb2USlG0aMJ8mGl8Ip59WPJEYHXzM0mMnjEnDezDqUULJW4suOpWpfiilPHErnmVxYXwF0J4s7IVjK7E6mcaQ1EGIAMG2y4V7R4bsnQVcTszshnFRePZ4CfQT3x+Ycyy2aYicAPkpsoCuPp52jOggG9MwY3vFiR3GmBzH6vKFHZ5DNt0aFWD/pEkWPSnHGpMLg01Sano6Djb26qsQQsl1kkktPlRSQRFBZOKAsTpfVwiRTVTiWwXmzsqclJsvjfABalZdoguVxPcCZVVR8nPKv7aZ8Sg8Yq4qXY1pdElrgHF31LQhEuXRuyu+P43KcDzwry9+X4DpMiyrcuPyR8CA2PPB9w6rpK9fR26UPjOGnyihV9VdnWPHEfpyE1NVza5VPyGFcTFuPviqeINGyOd1HgG8Rx+ziOFKG8sDhXMB9cHH+A40LrePaFnGRXekiu9Jt28XJBxonrOLIPs7iFD3BqnTs/wpnuWWVXTO+bNejeMIqDhO7uOHstzZx9Gx1yCNtvhAstuoR+cAYotdTRgzXM0S1NaNC1oPPisrT92riOhihqLxJzZn9lrOrcsUJAHinJo6Tlmwre+8K8EJdHK6Afy8bsOsmOMB9N5tH7gMvPFJTdwBO/DRbUbgA7DxSX7rHH/4wj3u+gXQPf+vnKo97uL50d9/fmFjCtQD84vXt9RzuK/Wlo9/tCCeHe6K+dOw77yJToTwv8MTp2jj+lxvZkvSmwOknRV3c8V+eznrkTYEfzOrhGHDi9Z1s7XlTVFUYynCP79z7Q6aWtClwmcmauC9orXUeN4Kqh9Na6/vb2Y9VUDWX4zD9n3kCkqRKCtI0ybdkyAbgofS3jWMSNXN+BuBnWmdqjs9OqG5ow7TWWuvfp+9dWmdgXr1xVuvZrXwixxn4cXuBAWMtlwtLNJJ0lW461nCCrmJkLbsh8cV9iyE1tTc+shhSs9b2vkUckXjLYoROgnaFvcIaCRLSIk6SUBZXM0pmDCFrF18cDOg9a7hL6wh+ZU+6YApvVtBdULcTB/+Gd25UcIx1k6POAMfORfncsz7Oh/d0Hjeuvf6a+2BP5XA0qY1jPtipHI4pWMUJkjUdNPPBToWF8pP0pFVcoOri6LU8TkIN6vUUtga6dbuQRqu4npdhLui1PC7GRVUvDKI90PXbhQLPUPbs4bYQ1NwiQnug6/ligAs0wOnYgEsnM2IVHAqRey+JLYGS1eAG3EuGl/vrmdXIwxVwPzHc7A9FKtWiSbS88kxTzOHZV1KpVqBWwJlKPOHFWQo3iyI0ukYjTYtUyFFR2AwXRfvsb3PdDRGOmuLYYtqeJthsOA6rEVuUzTyJ4b1mODlyeKqqNGsWYZEMO/Muy6Zw4qa4/vo8IPWuYdgwOiXhD+buzuXUtH7MRDBJcJ5qioOn5uri7ErUcJKGobXImDmLo3YznINklS0PRMQbSieTVYhsig2nfJdnVQpGKllxzxRCVr6PsjL+iJPyAwNC2i99emtagetjUVphAFC+UOafVeKlcCQAlK0NYfpqxSIe9JKyFwkBlG0GbNFu1ZjcS7l2IcsHWo5dUVHpcFM4KVE6adKGVGeqcGOxPG57dr48THBJr4CLvivLm9ZNrVaLBFC2CdVF+NXcvorCIyndnhe8FLeG7qAig3VTLX9BOBU4v08flPfCVOj5JJzSTS5rWHvHKd/NnJ5M2oIjynA+vD23POlKr3kcgMsyXBfO6/2Ktsi8vVVayuiCuFoFx6MKnCdWki4sw4Wg4ytMXbrg/bJdqBtgaysE4y5aftlE5wZaq+G4W1a42EDr2yvgOFqdMm8boeWDVsCx0gWd2+BdSVgBVzoubqPdnS6PYxWnFWyjvfnyWyvgytfCSjy0iQsr4MqHPQH3FJ5bPnZ8WVXg1k7h3PK4P6EKd2EV3KQi8MXac/j6CllBFc4/hz/D0kXAl54WL1nEdaW0hmNAV473LOJC0bW2orMFbAjYxJ2yiOPA19JzAGFj3Pn0EpRpM1wbeCqN+2tj3NMpHL1sA7fQGGt4REcb+Htqp1bTA0TawI9TuKanpXDgWgrXamgpDLiWik55w5NmSNBLqS3MvOk5ODG1U7hW01N6gt1HUjiGhpZCn7mpAYCh5qqARLxXUgEUiaaTbjTJ4ppOCQYipS+JTsPFsTRh6XCPCQwbbX0IrmUibwU1biTeNB3o44ojmISdywWCGaxNgnIAt1Bz0YfRJRwK+SDiaFccVmLsXPsKsHhYz/kRjEev1MXdxFFnttS5Nvdsqg7+2zZVB39fwN5pXXC3pcVT3cCjyKLqwDdCi6oDC32LqgMLO549Guim80eLONyj2CbuLqxeO3Zxz9vFnbaL+7Jd3Lpd3Ar52X8BXSURa9qZGGgAAAAASUVORK5CYII=);left: 50%;-webkit-transform: translateX(-50%);transform: translateX(-50%);background-size: 100%;top: 0;} .shopping-cart-empty .cart{width: 5.83333rem;height: 7.46rem;background: transparent url(data:image/png;base64,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) no-repeat;background-size: 100%;margin: 0 auto;}.shopping-cart-empty .button {width: 8.46667rem;height: 1.5rem;display: block;margin: 20rpx auto;}.empty-text {font-size: .64667rem;color: #222;margin-top: .53333rem;line-height: .74667rem;font-weight: 400;}.button-primary {border: 1px solid #de3c96;color: #de3c96;text-decoration: none;text-align: center;display: block;border-radius: .21267rem;line-height: 1.5rem;-webkit-appearance: none;background: none;padding: 0 .26667rem;margin: 0;white-space: nowrap;position: relative;text-overflow: ellipsis;font-size: .74333rem;font-family: inherit;cursor: pointer;user-select: none;} .cart_container {display: flex;flex-direction: row;background-color: #FFFFFF;margin-bottom: 10rpx;}.scroll {margin-bottom: 120rpx; }.column {display: flex;flex-direction: column;}.row {display: flex;flex-direction: row;align-items: center;}.sku {margin-left: 100rpx;position: absolute;right: 30rpx;margin-top: 30rpx; }.sku-price {color: red;position: relative;margin-top: 30rpx; }.price {color: red;position: relative;}.title {font-size: 32rpx;margin-top: 40rpx;}.small_text {font-size: 28rpx;margin-right: 40rpx;margin-left: 25rpx;}.item-select {width: 40rpx;height: 40rpx;margin-top: 90rpx;margin-left: 20rpx;}.item-allselect {width: 40rpx;height: 40rpx;margin-left: 20rpx;margin-top:25rpx;}.item-image {width: 180rpx;height: 180rpx;margin: 20rpx;} .bottom_line {width: 100%;height: 2rpx;background: lightgray;} .bottom_total {position: fixed;display: flex;flex-direction: column;bottom: 0;width: 100%;height: 120rpx;line-height: 120rpx;background: white;/* margin-top: 300rpx; */border-top: 1rpx solid #ccc;z-index: 99;}.button-red {background-color: #f0145a;position: fixed;right: 0;color: white;text-align: center;display: inline-block;font-size: 30rpx;border-radius: 0rpx;width: 30%;height: 120rpx;line-height: 120rpx;/* border: 1rpx solid #ccc; */}cart.js/*** 页面的初始数据*/data: {carts: [], //数据iscart: false,hidden: null,isAllSelect: false,totalMoney: 0,},onShow: function () {// 获取产品展示页保存的缓存数据（购物车的缓存数组，没有数据，则赋予一个空数组）var arr = wx.getStorageSync('cart') || [];console.info("缓存数据："+arr);// 有数据的话，就遍历数据，计算总金额 和 总数量if (arr.length > 0) {// 更新数据this.setData({carts: arr,iscart: true,hidden: false});console.info("缓存数据：" + this.data.carts);}else{this.setData({iscart: false,hidden: true,});}},三、购物车商品计算和删除缓存商品

cart.js//勾选事件处理函数switchSelect: function (e) {// 获取item项的id，和数组的下标值var Allprice = 0, i = 0;let id = e.target.dataset.id,index = parseInt(e.target.dataset.index);this.data.carts[index].isSelect = !this.data.carts[index].isSelect;//价钱统计if (this.data.carts[index].isSelect) {this.data.totalMoney = this.data.totalMoney + (this.data.carts[index].price * this.data.carts[index].count);}else {this.data.totalMoney = this.data.totalMoney - (this.data.carts[index].price * this.data.carts[index].count);}//是否全选判断for (i = 0; i < this.data.carts.length; i++) {Allprice = Allprice + (this.data.carts[index].price * this.data.carts[index].count);}if (Allprice == this.data.totalMoney) {this.data.isAllSelect = true;}else {this.data.isAllSelect = false;}this.setData({carts: this.data.carts,totalMoney: this.data.totalMoney,isAllSelect: this.data.isAllSelect,})},//全选allSelect: function (e) {//处理全选逻辑let i = 0;if (!this.data.isAllSelect) {this.data.totalMoney = 0;for (i = 0; i < this.data.carts.length; i++) {this.data.carts[i].isSelect = true;this.data.totalMoney = this.data.totalMoney + (this.data.carts[i].price * this.data.carts[i].count);}}else {for (i = 0; i < this.data.carts.length; i++) {this.data.carts[i].isSelect = false;}this.data.totalMoney = 0;}this.setData({carts: this.data.carts,isAllSelect: !this.data.isAllSelect,totalMoney: this.data.totalMoney,})},// 去结算toBuy() {wx.showToast({title: '去结算',icon: 'success',duration: 3000});this.setData({showDialog: !this.data.showDialog});},//数量变化处理handleQuantityChange(e) {var componentId = e.componentId;var quantity = e.quantity;this.data.carts[componentId].count.quantity = quantity;this.setData({carts: this.data.carts,});},/* 减数 */delCount: function (e) {var index = e.target.dataset.index;console.log("刚刚您点击了加一");var count = this.data.carts[index].count;// 商品总数量-1if (count > 1) {this.data.carts[index].count--;}// 将数值与状态写回this.setData({carts: this.data.carts});console.log("carts:" + this.data.carts);this.priceCount();},/* 加数 */addCount: function (e) {var index = e.target.dataset.index;console.log("刚刚您点击了加+");var count = this.data.carts[index].count;// 商品总数量+1if (count < 10) {this.data.carts[index].count++;}// 将数值与状态写回this.setData({carts: this.data.carts});console.log("carts:" + this.data.carts);this.priceCount();},priceCount: function (e) {this.data.totalMoney = 0;for (var i = 0; i < this.data.carts.length; i++) {if (this.data.carts[i].isSelect == true) {this.data.totalMoney = this.data.totalMoney + (this.data.carts[i].price * this.data.carts[i].count);}}this.setData({totalMoney: this.data.totalMoney,})},/* 删除item */delGoods: function (e) {this.data.carts.splice(e.target.id.substring(3),1);// 更新data数据对象if (this.data.carts.length > 0) {this.setData({carts: this.data.carts})wx.setStorageSync('cart', this.data.carts);this.priceCount();} else {this.setData({cart: this.data.carts,iscart: false,hidden: true,})wx.setStorageSync('cart', []);}}相关推荐：

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