🤔如何制作出下列效果呢?👇
😶🌫️首先:
设置css样式:
javascript"> <style>body {font-family: Arial, sans-serif;}.cart-item {width: 50%;margin-bottom: 15px;padding: 10px;border: 2px solid gray;border-radius: 10px;background-color: #ddd;}.buttons {margin-top: 5px;}.buttons button {padding: 5px 10px;margin-right: 5px;font-size: 16px;cursor: pointer;border: none;border-radius: 3px;background-color: pink;}.buttons input {width: 15px;}.buttons button:hover {background-color: yellow;}.quantity {font-size: 18px;font-weight: bold;margin-left: 10px;}h1, h2 {color: #333;}</style>
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🤓接下来:
1、可以使用v-for指令,假设有n个品类,则生成n个商品项
2、使用下标指令遍历商品的名字和遍历商品的价格
3、v-on事件绑定设置+、- 数量
javascript"> <!-- 提示:可以使用v-for指令,假设有n个品类,则生成n个商品项--><div class="cart-item" v-for="(item, index) in cartItems"><div class="buttons"><span>{{item.name}} </span><button v-on:click = "decreaseQuantity(index)">-</button><span class="quantity">{{ cartItems[index].quantity }} </span><button v-on:click = "increaseQuantity(index)">+</button><p>请输入价格:<input type="text" /> 元/斤 <br> 单价:1 元/斤</p></div></div><!-- 提示:可以用计算属性或数据变动侦听器,跟踪商品数和单价的变化,进而求出总数和总价--><h3>商品总数: <ins> {{totalItems}} </ins> 件</h3><h3>商品总价: <ins> 1 </ins> 元</h3></div>
2、🧐定义属性:
javascript"> // 1.定义属性:存储商品的(响应式)数组 const cartItems = reactive([{ name: '苹果', quantity: 1, unit_price: 1 },{ name: '香蕉', quantity: 1, unit_price: 1 },{ name: '菠萝', quantity: 1, unit_price: 1 },
3、🧐定义方法--增减数量
javascript"> // 2.定义方法:增加商品数const increaseQuantity = (index) => {cartItems[index].quantity += 1; }// 3.定义方法:减少商品数const decreaseQuantity = (index) => {if(cartItems[index].quantity > 1){cartItems[index].quantity -= 1;}}
4、🧐定义商品数量:
javascript">const totalItems = computed(() => {let total_items = 0;for(const item of cartItems){total_items += item.quantity;}return total_items})
😲最后返回函数:
javascript"> // 6.暴露属性和方法return {cartItems, increaseQuantity,decreaseQuantity,totalItems};},}).mount('#app');</script>
完整代码:👇
javascript"> <title>实战小项目:购物车</title><style>body {font-family: Arial, sans-serif;}.cart-item {width: 50%;margin-bottom: 15px;padding: 10px;border: 2px solid gray;border-radius: 10px;background-color: #ddd;}.buttons {margin-top: 5px;}.buttons button {padding: 5px 10px;margin-right: 5px;font-size: 16px;cursor: pointer;border: none;border-radius: 3px;background-color: pink;}.buttons input {width: 15px;}.buttons button:hover {background-color: yellow;}.quantity {font-size: 18px;font-weight: bold;margin-left: 10px;}h1, h2 {color: #333;}</style>
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<body><div id="app"><h1>实战小项目:购物车</h1><!-- 提示:可以使用v-for指令,假设有n个品类,则生成n个商品项--><div class="cart-item" v-for="(item, index) in cartItems"><div class="buttons"><span>{{item.name}} </span><button v-on:click = "decreaseQuantity(index)">-</button><span class="quantity">{{ cartItems[index].quantity }} </span><button v-on:click = "increaseQuantity(index)">+</button><p>请输入价格:<input type="text" /> 元/斤 <br> 单价:1 元/斤</p></div></div><!-- 提示:可以用计算属性或数据变动侦听器,跟踪商品数和单价的变化,进而求出总数和总价--><h3>商品总数: <ins> {{totalItems}} </ins> 件</h3><h3>商品总价: <ins> 1 </ins> 元</h3></div><script type="module">import { createApp, reactive, computed } from './vue.esm-browser.js'createApp({setup() {// 1.定义属性:存储商品的(响应式)数组 const cartItems = reactive([{ name: '苹果', quantity: 1, unit_price: 1 },{ name: '香蕉', quantity: 1, unit_price: 1 },{ name: '菠萝', quantity: 1, unit_price: 1 },]);// 2.定义方法:增加商品数const increaseQuantity = (index) => {cartItems[index].quantity += 1; }// 3.定义方法:减少商品数const decreaseQuantity = (index) => {if(cartItems[index].quantity > 1){cartItems[index].quantity -= 1;}}// 4.定义方法:计算商品总数const totalItems = computed(() => {let total_items = 0;for(const item of cartItems){total_items += item.quantity;}return total_items})// 5.定义方法:计算商品总价// 6.暴露属性和方法return {cartItems, increaseQuantity,decreaseQuantity,totalItems};},}).mount('#app');</script>
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