uniapp实现小程序购物车选购功能

点击付款未选中商品，会提示’请选择商品’

商品设置购买数最低为’0’，再点击’—‘号按钮提示’不能再减了’

商品的发售量为可购买商品的最大个数，当选择到发售量数值再点击’+‘号按钮系统就会提示’库存不足啦！’

购物车主体代码部分

<template>
	<view class="content">
		<div>
			<div class="homesteadQuery-time">
				  <div class="appearinCard">
				  	<div class="cardTitle" v-for="(item,index) in list" :key="index">
				  		    <div style="display: flex;align-items: center;margin-left: -6px;">
									<u-checkbox-group @change="checkboxGroupChange" style="width: 20px;">
									  	  <u-checkbox 
									  				@change="checkboxChange" 
									  				v-model="item.isChecked"
													shape="circle"
									  	  >
										  </u-checkbox>
									  </u-checkbox-group>
									  <img :src="item.imgName" class="imgName" @click="toDeail(item)">
				  		     </div>
				  			 <div class="cardContent">
				  			 		 <div class="cardContent-top">
				  			 				<div class="cardContent-top-right">
				  								<span>{{item.name}}</span>
				  								<div>
				  									  <span v-if="item.approveStatus=='01'" class="status">{{item.status}}</span>
				  									  <span v-if="item.approveStatus=='02'" class="status failed">{{item.status}}</span>
				  									  <span v-if="item.approveStatus=='03'" class="status success">{{item.status}}</span>
				  									  <span v-if="item.approveStatus=='04'" class="status purple">{{item.status}}</span>
				  									  <span v-if="item.approveStatus=='05'" class="status gray">{{item.status}}</span>
													  <span v-if="item.approveStatus=='06'" class="status one">{{item.status}}</span>
													  <span v-if="item.approveStatus=='07'" class="status two">{{item.status}}</span>
													  <span v-if="item.approveStatus=='08'" class="status three">{{item.status}}</span>
													  <span v-if="item.approveStatus=='09'" class="status four">{{item.status}}</span>
													  <span v-if="item.approveStatus=='10'" class="status five">{{item.status}}</span>
													  <span v-if="item.approveStatus=='11'" class="status six">{{item.status}}</span>
				  								</div>
				  							</div>
				  							
				  							<div style="display: flex;">
				  								<view class="reduce" @tap="reduce(item.id)">-</view>
				  								<view class="cart-count">{{item.requirement}}</view>
				  								<view class="add" @tap="add(item.id)">+</view>
				  							</div>
				  			 		 </div>
				  					 <div class="cardContent-top-buttom">
				  						  <div>
				  							   <div class="nameplate">需求量</div>
				  							   <div class="nameplate-count">{{item.requirement}}</div>
				  						  </div>
				  						  <div>
				  						  		<div class="nameplate">发售量</div>
				  						  		<div class="nameplate-count">{{item.salesvolume}}</div>
				  						  </div>
				  						  <div>
				  						  		<div class="nameplate">批发价</div>
				  						  		<div class="nameplate-count">¥{{item.wholesaleprice}}</div>
				  						  </div>
				  						  <div>
				  						  		<div class="nameplate">总价</div>
				  						  		<div class="nameplate-count">{{item.totalprice}}</div>
				  						  </div>
				  					 </div>
				  			 </div>
				  	    </div>
				  </div>
			</div>
		</div>
		<!-- 底部导航栏 -->
				<view class="tabbar">
				
					<view class="all">
							<u-button @click="checkedAll">全选</u-button>
					</view>
					<view class="totalPrice">
						总价:￥{{cartTotalPrice}}元
					</view>
					<view class="submitOrder" @tap="submitOrder">
						付款
					</view>
				</view>
	</view>
</template>

<script>
export default {
	data() {
		return {
			title: '',
			inputValue:'',
			totalprice:0,
			list:[],
			lessonLine:{
				lazyLoad:true
			},
			nowTime:'',
			countDown:30,
			countDownTimeout:null
		};
	},
	created(){
		this.onSearch()
	},
	computed:{
		// 购物车商品总价
		cartTotalPrice(){
				// 计算list列表中所有选中商品的价格
				var sum=0
				this.list.forEach(el=>{
					 sum=el.totalprice+sum
				})
				return sum
		}
	},
	methods: {
		onSearch() {
					this.list=[{id:'1',name:'西瓜',imgName:'../../static/fruitimg/西瓜.jpeg',approveStatus:'01',status:'宁夏',requirement:'0',salesvolume:10,wholesaleprice:5,totalprice:0,isChecked:false},
					           {id:'2',name:'榴莲',imgName:'../../static/fruitimg/榴莲.jpeg',approveStatus:'02',status:'马来西亚',requirement:'0',salesvolume:9,wholesaleprice:29,totalprice:0,isChecked:false},
							   {id:'3',name:'芒果',imgName:'../../static/fruitimg/芒果.jpeg',approveStatus:'03',status:'泰国',requirement:'0',salesvolume:8,wholesaleprice:9,totalprice:0,isChecked:false},
							   {id:'4',name:'苹果',imgName:'../../static/fruitimg/苹果.jpeg',approveStatus:'04',status:'新疆',requirement:'0',salesvolume:7,wholesaleprice:6,totalprice:0,isChecked:false},
							   {id:'5',name:'橘子',imgName:'../../static/fruitimg/橘子.jpeg',approveStatus:'05',status:'四川',requirement:'0',salesvolume:6,wholesaleprice:4,totalprice:0,isChecked:false},
							   {id:'6',name:'莲雾',imgName:'../../static/fruitimg/莲雾.jpeg',approveStatus:'06',status:'台湾',requirement:'0',salesvolume:6,wholesaleprice:30,totalprice:0,isChecked:false},
							   {id:'7',name:'葡萄',imgName:'../../static/fruitimg/葡萄.jpeg',approveStatus:'07',status:'云南',requirement:'0',salesvolume:6,wholesaleprice:12,totalprice:0,isChecked:false},
							   {id:'8',name:'桃子',imgName:'../../static/fruitimg/桃子.jpeg',approveStatus:'08',status:'陕西',requirement:'0',salesvolume:6,wholesaleprice:7,totalprice:0,isChecked:false},
							   {id:'9',name:'椰子',imgName:'../../static/fruitimg/椰子.jpeg',approveStatus:'09',status:'海南',requirement:'0',salesvolume:6,wholesaleprice:16,totalprice:0,isChecked:false},
							   {id:'10',name:'香蕉',imgName:'../../static/fruitimg/香蕉.jpeg',approveStatus:'10',status:'广东',requirement:'0',salesvolume:6,wholesaleprice:3,totalprice:0,isChecked:false},
							   {id:'11',name:'火龙果',imgName:'../../static/fruitimg/火龙果.jpeg',approveStatus:'11',status:'广西',requirement:'0',salesvolume:6,wholesaleprice:6,totalprice:0,isChecked:false},
							   ]
					// this.list.forEach((item,index)=>{
					// 		   item.imgName=require("../../static/"+parseInt(index+1)+".jpeg")
					// })
			  
				
		},
		editinfoBtn(item){
			  console.log('item',item)
			   uni.navigateTo({
			          url: '/pages/tabbar/toUser/userinfo?id='+item.id,
			   })
		},
		// 增加商品数量
		add(id) {
				this.list.forEach(el=>{
					if(el.id==id){
						if(el.requirement<el.salesvolume){
							   el.requirement++
							   // 商品小计价格也要改变
							   el.totalprice=el.requirement*el.wholesaleprice
						}else{
							   uni.showToast({
							   	   title:'库存不足啦！',
							   	   icon:'error',
							   })
						}
					}
				})
						
		},
		// 减少商品数量
		reduce(id) {
			this.list.forEach(el=>{
								if(el.id==id){
									if(el.requirement>0){
										el.requirement--
										// 商品小计价格也要改变
										el.totalprice=el.requirement*el.wholesaleprice
									}else{
											uni.showToast({
												title:'不能再减了！',
												icon:'error',
											})
							        }
								}
						})
		},
		// 提交购物车订单
		submitOrder(){
						// 判断是否选择购物车商品
						var bol=this.list.every(el=>el.isChecked==false)
						
						// 列表中未选中提示……
						if(bol){
							uni.showToast({
								title:'请选择商品',
								icon:'none'
							})
						}else{
							// 提交选中的订单列表
							var cartList=[];
							this.list.forEach(el=>{
								if(el.isChecked){
									cartList.push(el)
								}
							})
							// 购物车总价
							cartList.totalPrice=this.cartTotalPrice;
							
							// 购物车列表（购物车总价、购物车具体商品）
							console.log(cartList)
							
						}
						
					},
		// 选中某个复选框时，由checkbox时触发
		checkboxChange(e) {
			//console.log(e);
		},
		// 选中任一checkbox时，由checkbox-group触发
		checkboxGroupChange(e) {
			// console.log(e);
		},
		// 全选
		checkedAll() {
			this.list.forEach((item,index)=>{
				  if(item.isChecked==false){
				  	item.isChecked = true;
				  }else if(item.isChecked==true){
				  	item.isChecked = false;
				  }
			})
		},
		toDeail(item){
			uni.navigateTo({
			       url: '/pages/miaofruit/fruitinfo?id='+item.id,
			})
		}
	}
};
</script>

<style>
.content {
	background-image: linear-gradient(to top, #accbee 0%, #e7f0fd 100%);
	text-align: center;
	height: 400upx;
	margin-top: 20upx;
}
.homesteadQuery-time{
	height: 100vh;
	background-image: linear-gradient(to top, #accbee 0%, #e7f0fd 100%);
}
.appearinCard{
	    margin: auto;
		width: 92%;
		height: 86vh;
		overflow: scroll;
   }
   .appearinCard:active{
	   -moz-box-shadow:0px 0px 10px #27BF69;
	   box-shadow:0px 0px 10px #27BF69 ;
   }
   .cardTitle{
	   margin: auto;
	   display: flex;
	   padding: 10px 0px 5px 10px;
	   width: 100%;
	   vertical-align: middle;
	   background-color: #F5F5F5;
	   margin-top: 10px;
	   border-radius: 5px;
   }
   .titleName{
	   font-weight: bold;
	   font-size: 15px;
   }
   .titleTag{
	   font-size: 12px;
	   padding: 2px 20px;
	   line-height: 30px;
   }
   .cardContent{
	   width: 120%;
	   margin-top: 5px;
	   padding: 2px 5px;
   }
   .cardContent-top{
	   display: flex;
	   justify-content: space-between;
   }
   .cardContent-top-right{
	   display: flex;
   }
   .cardContent-top-buttom{
	   display: flex;
	   justify-content: space-between;
	   font-size: 10px;
	   padding-top: 20px;
	   
   }
   .nameplate{
	   /* background-color: #C0C4CC;*/
		background-image: linear-gradient(to top, #e6e9f0 0%, #eef1f5 100%);
		padding: 2px 8px;
		border-radius: 3px;
   }
   .nameplate-count{
	    font-weight:800;
		padding-top: 5px;
   }
   .status{
	   font-size: 10px;
	   padding: 4px 10px;
	   border-radius: 20px;
	   margin: -3px 0px 0px 10px;
	   background: rgba(8,162,201,0.1);
	   text-align: center;
	   display: inline-block;
	   color: #31A6F5;
	   vertical-align: middle;
   }
   .success{
	   background:rgba(24,204,144,0.2);
	   color: #18CC90;
   }
   .failed{
   	   background:rgba(255,92,114,0.2);
   	   color: #FF5C72;
   }
   .gray{
   	   background:rgba(254,195,13,0.2);
   	   color: #FFC40D;
   }
   .purple{
   	   background:rgba(181,88,253,0.2);
   	   color: #B558FD;
   }
   .one{
	   background:rgba(228,130,138,0.2);
	   color:#f78ca0 ;
   }
   .two{
   	   background:rgba(115,138,210,0.2);
   	   color:#48c6ef ;
   }
   .three{
   	   background:rgba(87,179,126,0.2);
   	   color:#0ba360 ;
   }
   .four{
   	   background:rgba(61,107,134,0.2);
   	   color:#13547a ;
   }
   .five{
   	   background:rgba(228,81,40,0.2);
   	   color:#f83600 ;
   }
   .six{
   	   background:rgba(115,216,99,0.2);
   	   color:#0fd850 ;
   }
   .imgName{
	   width: 76px;
	   height: 80px;
	   margin:0px 5px 0px 3px;
	  /* border: 0.5px solid #000000;*/
	   border-radius: 6px;
   }
   .reduce{
   		width: 40rpx;
   		height: 40rpx;
   		background: #F1ECE7;
   		border-radius: 21.6rpx;
   		border-radius: 21.6rpx;
   		color: #979797;
   		font-size: 35rpx;
		line-height: 40rpx;
   }
   .add{
   		width: 40rpx;
   		height: 40rpx;
   		background: #F1ECE7;
   		border-radius: 21.6rpx;
   		border-radius: 21.6rpx;
   		color: #979797;
   		font-size: 35rpx;
		line-height: 40rpx;
   }
   .cart-count{
   		width: 72rpx;
   		height: 40rpx;
   	    background: #F1ECE7;
   	    border-radius: 21.6rpx;
   	    border-radius: 21.6rpx;
   	    margin-left: 18rpx;
   		margin-right: 18rpx;
   		text-align: center;
   		line-height: 40rpx;
   	}
	// 底部导航
	.tabbar {
		width: 100%;
		height: 150rpx;
		/*background-color: #f3f3f3;*/
		background-image: linear-gradient(to top, #feada6 0%, #f5efef 100%);
		position: fixed;
		bottom: 0rpx;
		display: flex;
		align-items: center;
		justify-content: space-around;
		border-top-left-radius:10px;
		border-top-right-radius:10px;
	}
	.all {
		font-size: 32rpx;
		color: #3E3E3E;
		letter-spacing: 2.29rpx;
		display: flex;
	}
	.totalPrice {
		font-size: 32rpx;
		color: #3E3E3E;
		letter-spacing: 2.29rpx;
		color:red;
	}
	.submitOrder {
		width: 208rpx;
		height: 80rpx;
		/*background: #354E44;*/
		background-image: linear-gradient(to top, #00c6fb 0%, #005bea 100%);
		border-radius: 14rpx;
		border-radius: 14rpx;
		font-size: 36rpx;
		color: #FFFFFF;
		letter-spacing: 2.57rpx;
		display: flex;
		align-items: center;
		justify-content: center;
	}
	.submitOrder:hover{
		background-image: linear-gradient(to top, #48c6ef 0%, #6f86d6 100%);
	}
</style>

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点击图片显示商品详情信息页面

<template>
	  <div>
		   <div>
			   <div class="icon">
			   		<img :src="icon" />
			   </div>
			   <u-cell-group>
			   <u-cell-item title="学名" v-model="userInfo.name" :arrow="false"></u-cell-item>
			   <u-cell-item title="产地" v-model="userInfo.chandi" :arrow="false"></u-cell-item>
			   <u-cell-item title="单价" v-model="userInfo.danjia" :arrow="false"></u-cell-item>
			   <u-cell-item title="规格" v-model="userInfo.guige" :arrow="false"></u-cell-item>
			   <u-cell-item title="口味" v-model="userInfo.kouwei" :arrow="false"></u-cell-item>
			   <u-cell-item title="生长周期" v-model="userInfo.zhouqi" :arrow="false"></u-cell-item>
			   <u-cell-item title="上市事件" v-model="userInfo.time" :arrow="false"></u-cell-item>
			   <u-cell-item title="总结" v-model="userInfo.info" :arrow="false"></u-cell-item>
			   </u-cell-group>
		   </div>
	  </div>
</template>
<script>
	export default {
		data(){
			return{
				//userInfo:{},
				icon:''
			}
		},
		onLoad(options){
			this.getUserInfo(options.id)
		},
		created(){
			
		},
		methods:{
			 getUserInfo(data){
				 if(data==1){
					        this.$set(this.userInfo,'name','西瓜?');
					        this.$set(this.userInfo,'chandi','宁夏??');
					        this.$set(this.userInfo,'danjia','¥5');
					        this.$set(this.userInfo,'guige','大果');
					        this.$set(this.userInfo,'kouwei','脆甜');
					        this.$set(this.userInfo,'zhouqi','180天');
					        this.$set(this.userInfo,'time','5-9月');
					        this.$set(this.userInfo,'info','麒麟瓜好吃的呢，真好吃?');
							this.icon=require("../../static/fruitimg/西瓜.jpeg")
				 }else if(data==2){
				 		    this.$set(this.userInfo,'name','榴莲');
				 		    this.$set(this.userInfo,'chandi','马来西亚??');
				 		    this.$set(this.userInfo,'danjia','¥29');
				 		    this.$set(this.userInfo,'guige','大果');
				 		    this.$set(this.userInfo,'kouwei','脆甜');
				 		    this.$set(this.userInfo,'zhouqi','200天');
				 		    this.$set(this.userInfo,'time','5-10月');
				 		    this.$set(this.userInfo,'info','猫山王榴莲好吃的呢，真好吃?');
				 		    this.icon=require("../../static/fruitimg/榴莲.jpeg")
				 }else if(data==3){
				 			this.$set(this.userInfo,'name','芒果?');
				 			this.$set(this.userInfo,'chandi','泰国??');
				 			this.$set(this.userInfo,'danjia','¥9');
				 			this.$set(this.userInfo,'guige','大果');
				 			this.$set(this.userInfo,'kouwei','脆甜');
				 			this.$set(this.userInfo,'zhouqi','160天');
				 			this.$set(this.userInfo,'time','6-9月');
				 			this.$set(this.userInfo,'info','鹰嘴芒好吃的呢，真好吃?');
				 			this.icon=require("../../static/fruitimg/芒果.jpeg")
				 }else if(data==4){
				 			this.$set(this.userInfo,'name','苹果?');
				 			this.$set(this.userInfo,'chandi','新疆');
				 			this.$set(this.userInfo,'danjia','¥6');
				 			this.$set(this.userInfo,'guige','大果');
				 			this.$set(this.userInfo,'kouwei','脆甜');
				 			this.$set(this.userInfo,'zhouqi','110天');
				 			this.$set(this.userInfo,'time','5-9月');
				 			this.$set(this.userInfo,'info','苹果好吃的呢，真好吃?');
				 			this.icon=require("../../static/fruitimg/苹果.jpeg")
				 }else if(data==5){
				 			this.$set(this.userInfo,'name','橘子?');
				 			this.$set(this.userInfo,'chandi','四川');
				 			this.$set(this.userInfo,'danjia','¥4');
				 			this.$set(this.userInfo,'guige','大果');
				 			this.$set(this.userInfo,'kouwei','脆甜');
				 			this.$set(this.userInfo,'zhouqi','120天');
				 			this.$set(this.userInfo,'time','全年供应');
				 			this.$set(this.userInfo,'info','橘子好吃的呢，真好吃?');
				 			this.icon=require("../../static/fruitimg/橘子.jpeg")
				 }else if(data==6){
				 			this.$set(this.userInfo,'name','莲雾');
				 			this.$set(this.userInfo,'chandi','台湾');
				 			this.$set(this.userInfo,'danjia','¥30');
				 			this.$set(this.userInfo,'guige','大果');
				 			this.$set(this.userInfo,'kouwei','脆甜');
				 			this.$set(this.userInfo,'zhouqi','180天');
				 			this.$set(this.userInfo,'time','8-10月');
				 			this.$set(this.userInfo,'info','莲雾好吃的呢，真好吃?');
				 			this.icon=require("../../static/fruitimg/莲雾.jpeg")
				 }else if(data==7){
				 			this.$set(this.userInfo,'name','葡萄?');
				 			this.$set(this.userInfo,'chandi','云南');
				 			this.$set(this.userInfo,'danjia','¥12');
				 			this.$set(this.userInfo,'guige','大果');
				 			this.$set(this.userInfo,'kouwei','脆甜');
				 			this.$set(this.userInfo,'zhouqi','180天');
				 			this.$set(this.userInfo,'time','全年供应');
				 			this.$set(this.userInfo,'info','葡萄好吃的呢，真好吃?');
				 			this.icon=require("../../static/fruitimg/葡萄.jpeg")
				 }else if(data==8){
				 			this.$set(this.userInfo,'name','桃子?');
				 			this.$set(this.userInfo,'chandi','陕西');
				 			this.$set(this.userInfo,'danjia','¥7');
				 			this.$set(this.userInfo,'guige','大果');
				 			this.$set(this.userInfo,'kouwei','脆甜');
				 			this.$set(this.userInfo,'zhouqi','180天');
				 			this.$set(this.userInfo,'time','5-8月');
				 			this.$set(this.userInfo,'info','桃子好吃的呢，真好吃?');
				 			this.icon=require("../../static/fruitimg/桃子.jpeg")
				 }else if(data==9){
				 			this.$set(this.userInfo,'name','椰子?');
				 			this.$set(this.userInfo,'chandi','海南');
				 			this.$set(this.userInfo,'danjia','¥16');
				 			this.$set(this.userInfo,'guige','大果');
				 			this.$set(this.userInfo,'kouwei','脆甜');
				 			this.$set(this.userInfo,'zhouqi','180天');
				 			this.$set(this.userInfo,'time','6-10月');
				 			this.$set(this.userInfo,'info','椰子好吃的呢，真好吃?');
				 			this.icon=require("../../static/fruitimg/椰子.jpeg")
				 }else if(data==10){
				 			this.$set(this.userInfo,'name','香蕉?');
				 			this.$set(this.userInfo,'chandi','广东');
				 			this.$set(this.userInfo,'danjia','¥4');
				 			this.$set(this.userInfo,'guige','大果');
				 			this.$set(this.userInfo,'kouwei','脆甜');
				 			this.$set(this.userInfo,'zhouqi','3天');
				 			this.$set(this.userInfo,'time','全年供应');
				 			this.$set(this.userInfo,'info','香蕉好吃的呢，真好吃?');
				 			this.icon=require("../../static/fruitimg/香蕉.jpeg")
				 }else if(data==11){
				 			this.$set(this.userInfo,'name','火龙果');
				 			this.$set(this.userInfo,'chandi','广西');
				 			this.$set(this.userInfo,'danjia','¥6');
				 			this.$set(this.userInfo,'guige','大果');
				 			this.$set(this.userInfo,'kouwei','脆甜');
				 			this.$set(this.userInfo,'zhouqi','120天');
				 			this.$set(this.userInfo,'time','6-11月');
				 			this.$set(this.userInfo,'info','火龙果好吃的呢，真好吃?');
				 			this.icon=require("../../static/fruitimg/火龙果.jpeg")
				 }
			 }
		}
	}
</script>

<style>
	 .icon{
		 display: flex;
		 justify-content: center;
	 }
	 .icon img{
		  width: 150px;
		  height: 118px;
		  border-radius: 8px;
		  margin-bottom: 10px;
		  border: 0.5px solid #000000;
	 }
</style>

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