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這篇文章將為大家詳細(xì)講解有關(guān)微信小程序商城開發(fā)之怎樣實(shí)現(xiàn)商品加入購(gòu)物車功能，小編覺得挺實(shí)用的，因此分享給大家做個(gè)參考，希望大家閱讀完這篇文章后可以有所收獲。
看效果
購(gòu)物車.gif
開發(fā)計(jì)劃
1、商品詳情頁將商品信息放入緩存
2、購(gòu)物車頁面讀取緩存獲取商品信息
3、購(gòu)物車商品計(jì)算和刪除緩存商品
一、商品詳情頁將商品信息放入緩存
detail.wxml
<button data-goodid="{{goods.goodsId}}" class="button-addCar" bindtap="addCar" formType="submit">確定</button>綁定bindtap事件將商品加入購(gòu)物車。
detail.js
/**
* 加入購(gòu)物車
*/
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) + '...';
}
// 獲取購(gòu)物車的緩存數(shù)組（沒有數(shù)據(jù)，則賦予一個(gè)空數(shù)組）
var arr = wx.getStorageSync('cart') || [];
console.log("arr,{}", arr);
if (arr.length > 0) {
// 遍歷購(gòu)物車數(shù)組
for (var j in arr) {
// 判斷購(gòu)物車內(nèi)的item的id，和事件傳遞過來的id，是否相等
if (arr[j].goodsId == goodsId) {
// 相等的話，給count+1（即再次添加入購(gòu)物車，數(shù)量+1）
arr[j].count = arr[j].count + 1;
// 最后，把購(gòu)物車數(shù)據(jù)，存放入緩存（此處不用再給購(gòu)物車數(shù)組push元素進(jìn)去，因?yàn)檫@個(gè)是購(gòu)物車有的，直接更新當(dāng)前數(shù)組即可）
try {
wx.setStorageSync('cart', arr)
} catch (e) {
console.log(e)
}
//關(guān)閉窗口
wx.showToast({
title: '加入購(gòu)物車成功！',
icon: 'success',
duration: 2000
});
this.closeDialog();
// 返回（在if內(nèi)使用return，跳出循環(huán)節(jié)約運(yùn)算，節(jié)約性能）
return;
}
}
// 遍歷完購(gòu)物車后，沒有對(duì)應(yīng)的item項(xiàng)，把goodslist的當(dāng)前項(xiàng)放入購(gòu)物車數(shù)組
arr.push(goods);
} else {
arr.push(goods);
}
// 最后，把購(gòu)物車數(shù)據(jù)，存放入緩存
try {
wx.setStorageSync('cart', arr)
// 返回（在if內(nèi)使用return，跳出循環(huán)節(jié)約運(yùn)算，節(jié)約性能）
//關(guān)閉窗口
wx.showToast({
title: '加入購(gòu)物車成功！',
icon: 'success',
duration: 2000
});
this.closeDialog();
return;
} catch (e) {
console.log(e)
}
}二、購(gòu)物車頁面讀取緩存獲取商品信息
cart.wxml
<view class="J-shopping-cart-empty" hidden="{{iscart}}"><view class="shopping-cart-empty">
<view class="bg"></view>
<view class="cart"></view>
<text class='empty-text'>購(gòu)物車空空如也</text>
<p></p>
<navigator url="/pages/goods/goods">
<a href="//m.vip.com" class="button button-primary" >
去搶購(gòu) </a>
</navigator>
</view></view> <view class="scroll" hidden="{{hidden}}"><scroll-view class="scroll" scroll-y="true">
<view class="separate"></view>
<view wx:for="{{carts}}">
<view class="cart_container">
<view wx:if="{{!item.isSelect}}">
<icon class="item-select" bindtap="switchSelect" data-index="{{index}}" data-id="{{index}}" type="circle" size="20"></icon>
</view>
<view wx:elif="{{item.isSelect}}">
<icon class="item-select" bindtap="switchSelect" data-index="{{index}}" data-id="{{index}}" type="success" color="#f0145a" size="20"></icon>
</view>
<image class="item-image" src="{{item.imgUrl}}"></image>
<import src="../template/template.wxml" />
<view class="column">
<text class="title">{{item.title}}</text>
<image bindtap="delGoods" id="img{{index}}" data-index="{{index}}" src="../../images/del.png"></image>
<view class="row">
<text class="sku-price">￥{{item.price * item.count}}</text>
<view class="sku">
<template is="quantity" data="{{ ...item,index:index}}" />
</view>
</view>
</view>
</view>
<view class="separate"></view>
</view></scroll-view></view>
<view class="bottom_total" hidden="{{hidden}}">
<view class="bottom_line"></view>
<view class="row">
<view wx:if="{{!isAllSelect}}">
<icon class="item-allselect" bindtap="allSelect" type="circle" size="20"></icon>
</view>
<view wx:elif="{{isAllSelect}}">
<icon class="item-allselect" bindtap="allSelect" type="success" color="#f0145a" size="20"></icon>
</view>
<text class="small_text">全選</text>
<text>合計(jì):￥ </text>
<text class="price">{{totalMoney}}</text>
<button class="button-red" bindtap="toBuy" formType="submit">去結(jié)算 </button>
</view></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,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);
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
/**
* 頁面的初始數(shù)據(jù)
*/
data: {
carts: [], //數(shù)據(jù)
iscart: false,
hidden: null,
isAllSelect: false,
totalMoney: 0,
},
onShow: function () {
// 獲取產(chǎn)品展示頁保存的緩存數(shù)據(jù)（購(gòu)物車的緩存數(shù)組，沒有數(shù)據(jù)，則賦予一個(gè)空數(shù)組）
var arr = wx.getStorageSync('cart') || [];
console.info("緩存數(shù)據(jù)："+arr); // 有數(shù)據(jù)的話，就遍歷數(shù)據(jù)，計(jì)算總金額 和 總數(shù)量
if (arr.length > 0) {
// 更新數(shù)據(jù)
this.setData({
carts: arr,
iscart: true,
hidden: false
});
console.info("緩存數(shù)據(jù)：" + this.data.carts);
}else{
this.setData({
iscart: false,
hidden: true,
});
}
},三、購(gòu)物車商品計(jì)算和刪除緩存商品
cart.js
//勾選事件處理函數(shù)
switchSelect: function (e) {
// 獲取item項(xiàng)的id，和數(shù)組的下標(biāo)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; //價(jià)錢統(tǒng)計(jì)
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);
}
//是否全選判斷
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,
})
},
//全選
allSelect: function (e) {
//處理全選邏輯
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,
})
}, // 去結(jié)算
toBuy() {
wx.showToast({
title: '去結(jié)算',
icon: 'success',
duration: 3000
});
this.setData({
showDialog: !this.data.showDialog
});
}, //數(shù)量變化處理
handleQuantityChange(e) {
var componentId = e.componentId;
var quantity = e.quantity;
this.data.carts[componentId].count.quantity = quantity;
this.setData({
carts: this.data.carts,
});
},
/* 減數(shù) */
delCount: function (e) {
var index = e.target.dataset.index;
console.log("剛剛您點(diǎn)擊了加一");
var count = this.data.carts[index].count; // 商品總數(shù)量-1
if (count > 1) {
this.data.carts[index].count--;
}
// 將數(shù)值與狀態(tài)寫回
this.setData({
carts: this.data.carts
});
console.log("carts:" + this.data.carts);
this.priceCount();
},
/* 加數(shù) */
addCount: function (e) {
var index = e.target.dataset.index;
console.log("剛剛您點(diǎn)擊了加+");
var count = this.data.carts[index].count; // 商品總數(shù)量+1
if (count < 10) {
this.data.carts[index].count++;
}
// 將數(shù)值與狀態(tài)寫回
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,
})
},
/* 刪除item */
delGoods: function (e) {
this.data.carts.splice(e.target.id.substring(3),1); // 更新data數(shù)據(jù)對(duì)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', []);
}
}關(guān)于“微信小程序商城開發(fā)之怎樣實(shí)現(xiàn)商品加入購(gòu)物車功能”這篇文章就分享到這里了，希望以上內(nèi)容可以對(duì)大家有一定的幫助，使各位可以學(xué)到更多知識(shí)，如果覺得文章不錯(cuò)，請(qǐng)把它分享出去讓更多的人看到。
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