购物车小计

Posted 2021-07-25 web半晨

目录

• • 1、html 部分
  • 2、JavaScript 部分
  • 3、css 部分
  • 4、演示

---

1、html 部分

<div id="app" class="cart_box">
	<ul class="cart_top">
		<li class="cart_top_item" v-for="(item,i) in dataList" v-bind:key="item.id">
			<div class="item_left">
				<p class="cursor_pointer" @click="handle('minus',i)">-</p>
				<p class="counts" v-text="item.count"></p>
				<p class="cursor_pointer" @click="handle('puls',i)">+</p>
			</div>

			<div class="item_right">
				单价: <strong v-html="item.price+'元'"></strong> 
				小计: <strong v-html="computedTotal(item.count,item.price)"></strong>
			</div>
		</li>
	</ul>

	<div class="cart_bottom">
		<span>商品合计：<em v-html="total"></em> 件，</span>
		<span>共花费：<em v-html="totalPrice.toFixed(2)"></em> 元，</span>
		<span>其中最贵的商品单价是：<em v-html="maxPrice.toFixed(2)"></em> 元。</span>
	</div>
</div>

---

2、javascript 部分

let sourceData = [
	{
		id: 1,
		price: 60.32,
		count: 0
	}, 
	{
		id: 2,
		price: 50.26,
		count: 0
	}, 
	{
		id: 3,
		price: 40.33,
		count: 0
	}, 
	{
		id: 4,
		price: 30.02,
		count: 0
	}, 
	{
		id: 5,
		price: 20.03,
		count: 0
	}, 
	{
		id: 6,
		price: 10.99,
		count: 0
	}, 
	{
		id: 7,
		price: 12.95,
		count: 0
	}
];

new Vue({
	el: '#app',
	data: {
		dataList: sourceData
	},

	methods: {
		computedTotal(count, price) {
			return (count * price).toFixed(2) + '元';
		},

		handle(type, i) {
			let data = this.dataList[i];
			if (type == 'minus') {
				data.count--;
				data.count <= 0 ? data.count = 0 : null;
			} else if (type == 'puls') {
				data.count++;
				data.count >= 10 ? data.count = 10 : null;
			}
		}
	},

	computed: {
		// 总数
		total() {
			// 第一种方法
			// let total = 0;
			// this.dataList.forEach(item => {
			//     total += item.count;
			// });
			// return total;

			// 第二种方法
			return this.dataList.reduce((accumulator, item) => {
				return accumulator + item.count;
			}, 0);
		},

		// 总价
		totalPrice() {
			return this.dataList.reduce((accumulator, item) => {
				return accumulator + item.count * item.price;
			}, 0);
		},

		// 最大单价
		maxPrice() {
			let arr = this.dataList.filter(item => {
				return item.count >= 1;
			}).map(item => {
				return item.price;
			});
			return arr.length == 0 ? 0 : Math.max(...arr);
		}
	}
});

---

3、css 部分

ul,
li {
	margin: 0;
	padding: 0;
	list-style: none;
}
        
.cart_box {
	width: 600px;
	margin-top: 60px;
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
}
        
.cart_top {
	background-color: #555555;
	border-radius: 10px 10px 0 0;
	padding: 5px 20px;
	box-sizing: border-box;
}
        
.cart_top_item {
	margin: 20px 0;
	display: flex;
	justify-content: space-around;
	align-items: center;
 }
        
.item_left {
	flex: 2;
	display: flex;
	justify-content: space-between;
	align-items: center;
}
        
.cursor_pointer {
	cursor: pointer;
	background-color: #333333;
	font-size: 32px;
	font-weight: 600;
	color: #FFFFFF;
}
        
.counts {
	background-color: #FFFFFF;
	margin: 0 16px;
	font-size: 22px;
}
        
.item_left>p {
	width: 50px;
	height: 32px;
	line-height: 32px;
	margin-top: 0;
	margin-bottom: 0;
	text-align: center;
	border-radius: 5px;
}
        
.item_right {
	flex: 6;
	height: 32px;
	line-height: 32px;
	margin-left: 36px;
	background-color: #222222;
	color: #888888;
	padding: 0 16px;
	box-sizing: border-box;
}
        
.item_right>strong:first-child {
	margin-right: 12px;
}
        
.cart_bottom {
	background-color: #333333;
	border-radius: 0 0 10px 10px;
	color: #a88a8a;
	padding: 16px 20px;
	box-sizing: border-box;
	font-size: 14px;
}
        
.cart_bottom>span>em {
	background-color: #EEEEEE;
	padding: 6px 10px;
	box-sizing: border-box;
	color: #333333;
	font-size: 16px;
}

---

4、演示

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