本章节为大家介绍几个 Vue.js 实例，通过实例练习来巩固学到的知识点。
一、导航菜单实例
创建一个简单的导航菜单：
<div id="main"> <!-- 激活的菜单样式为 active 类 --> <!-- 为了阻止链接在点击时跳转，我们使用了 "prevent" 修饰符 (preventDefault 的简称)。 --> <nav v-bind:class="active" v-on:click.prevent> <!-- 当菜单上的链接被点击时，我们调用了 makeActive 方法, 该方法在 Vue 实例中创建。 --> <a href="#" class="home" v-on:click="makeActive('home')">Home</a> <a href="#" class="projects" v-on:click="makeActive('projects')">Projects</a> <a href="#" class="services" v-on:click="makeActive('services')">Services</a> <a href="#" class="contact" v-on:click="makeActive('contact')">Contact</a> </nav> <!-- 以下 "active" 变量会根据当前选中的值来自动变换 --> <p>您选择了 <b>{{active}} 菜单</b></p> </div> <script> // 创建一个新的 Vue 实例 var demo = new Vue({ // DOM 元素，挂载视图模型 el: '#main', // 定义属性，并设置初始值 data: { active: 'home' }, // 点击菜单使用的函数 methods: { makeActive: function(item){ // 模型改变，视图会自动更新 this.active = item; } } }); </script>
二、编辑文本实例
点击指定文本编辑内容：
<!-- v-cloak 隐藏未编译的变量，直到 Vue 实例准备就绪。 --> <!-- 元素点击后 hideTooltp() 方法被调用 --> <div id="main" v-cloak v-on:click="hideTooltip"> <!-- 这是一个提示框 v-on:click.stop 是一个点击事件处理器，stop 修饰符用于阻止事件传递 v-if 用来判断 show_tooltip 为 true 时才显示 --> <div class="tooltip" v-on:click.stop v-if="show_tooltip"> <!-- v-model 绑定了文本域的内容 在文本域内容改变时，对应的变量也会实时改变 --> <input type="text" v-model="text_content" /> </div> <!-- 点击后调用 "toggleTooltip" 方法并阻止事件传递 --> <!-- "text_content" 变量根据文本域内容的变化而变化 --> <p v-on:click.stop="toggleTooltip">{{text_content}}</p> </div> <script> var demo = new Vue({ el: '#main', data: { show_tooltip: false, text_content: '点我，并编辑内容。' }, methods: { hideTooltip: function(){ // 在模型改变时，视图也会自动更新 this.show_tooltip = false; }, toggleTooltip: function(){ this.show_tooltip = !this.show_tooltip; } } }) </script>
三、订单列表实例
创建一个订单列表，并计算总价：
<form id="main" v-cloak> <h1>Services</h1> <ul> <!-- 循环输出 services 数组, 设置选项点击后的样式 --> <li v-for="service in services" v-on:click="toggleActive(service)" v-bind:class="{ 'active': service.active}"> <!-- 显示订单中的服务名，价格 Vue.js 定义了货币过滤器，用于格式化价格 --> {{service.name}} <span>{{service.price | currency}}</span> </li> </ul> <div class="total"> <!-- 计算所有服务的价格，并格式化货币 --> Total: <span>{{total() | currency}}</span> </div> </form> <script> // 自定义过滤器 "currency". Vue.filter('currency', function (value) { return '$' + value.toFixed(2); }); var demo = new Vue({ el: '#main', data: { // 定义模型属性 the model properties. The view will loop // 视图将循环输出数组的数据 services: [ { name: 'Web Development', price: 300, active:true },{ name: 'Design', price: 400, active:false },{ name: 'Integration', price: 250, active:false },{ name: 'Training', price: 220, active:false } ] }, methods: { toggleActive: function(s){ s.active = !s.active; }, total: function(){ var total = 0; this.services.forEach(function(s){ if (s.active){ total+= s.price; } }); return total; } } }); </script>
四、搜索页面实例
在输入框输入搜索内容，列表显示配置的列表：
<form id="main" v-cloak> <div class="bar"> <!-- searchString 模型与文本域创建绑定 --> <input type="text" v-model="searchString" placeholder="输入搜索内容" /> </div> <ul> <!-- 循环输出数据 --> <li v-for="article in filteredArticles"> <a v-bind:href="article.url"><img v-bind:src="article.image" /></a> <p>{{article.title}}</p> </li> </ul> </form> <script> var demo = new Vue({ el: '#main', data: { searchString: "", // 数据模型，实际环境你可以根据 Ajax 来获取 articles: [ { "title": "What You Need To Know About CSS Variables", "url": "https://www.runoob.com/css/css-tutorial.html", "image": "https://static.runoob.com/images/icon/css.png" }, { "title": "Freebie: 4 Great Looking Pricing Tables", "url": "https://www.runoob.com/html/html-tutorial.html", "image": "https://static.runoob.com/images/icon/html.png" }, { "title": "20 Interesting JavaScript and CSS Libraries for February 2016", "url": "https://www.runoob.com/css3/css3-tutorial.html", "image": "https://static.runoob.com/images/icon/css3.png" }, { "title": "Quick Tip: The Easiest Way To Make Responsive Headers", "url": "https://www.runoob.com/css3/css3-tutorial.html", "image": "https://static.runoob.com/images/icon/css3.png" }, { "title": "Learn SQL In 20 Minutes", "url": "https://www.runoob.com/sql/sql-tutorial.html", "image": "https://static.runoob.com/images/icon/sql.png" }, { "title": "Creating Your First Desktop App With HTML, JS and Electron", "url": "https://www.runoob.com/js/js-tutorial.html", "image": "https://static.runoob.com/images/icon/html.png" } ] }, computed: { // 计算数学，匹配搜索 filteredArticles: function () { var articles_array = this.articles, searchString = this.searchString; if(!searchString){ return articles_array; } searchString = searchString.trim().toLowerCase(); articles_array = articles_array.filter(function(item){ if(item.title.toLowerCase().indexOf(searchString) !== -1){ return item; } }) // 返回过滤后的数据 return articles_array;; } } }); </script>
五、切换不同布局实例
点击右上角的按钮来切换不同页面布局：
<form id="main" v-cloak> <div class="bar"> <!-- 两个按钮用于切换不同的列表布局 --> <a class="list-icon" v-bind:class="{ 'active': layout == 'list'}" v-on:click="layout = 'list'"></a> <a class="grid-icon" v-bind:class="{ 'active': layout == 'grid'}" v-on:click="layout = 'grid'"></a> </div> <!-- 我们设置了两套布局页面。使用哪套依赖于 "layout" 绑定 --> <ul v-if="layout == 'grid'" class="grid"> <!-- 使用大图，没有文本 --> <li v-for="a in articles"> <a v-bind:href="a.url" target="_blank" rel="noopener noreferrer"><img v-bind:src="a.image.large" /></a> </li> </ul> <ul v-if="layout == 'list'" class="list"> <!-- 使用小图及标题 --> <li v-for="a in articles"> <a v-bind:href="a.url" target="_blank" rel="noopener noreferrer"><img v-bind:src="a.image.small" /></a> <p>{{a.title}}</p> </li> </ul> </form> <script> var demo = new Vue({ el: '#main', data: { // 视图模型，可能的值是 "grid" 或 "list"。 layout: 'grid', articles: [{ "title": "HTML 教程", "url": "https://www.runoob.com/html/html-tutorial.html", "image": { "large": "https://static.runoob.com/images/mix/htmlbig.png", "small": "https://static.runoob.com/images/icon/html.png" } }, { "title": "CSS 教程", "url": "https://www.runoob.com/css/css-tutorial.html", "image": { "large": "https://static.runoob.com/images/mix/cssbig.png", "small": "https://static.runoob.com/images/icon/css.png" } }, { "title": "JS 教程", "url": "https://www.runoob.com/js/js-tutorial.html", "image": { "large": "https://static.runoob.com/images/mix/jsbig.jpeg", "small": "https://static.runoob.com/images/icon/js.png" } }, { "title": "SQL 教程", "url": "https://www.runoob.com/sql/sql-tutorial.html", "image": { "large": "https://static.runoob.com/images/mix/sqlbig.png", "small": "https://static.runoob.com/images/icon/sql.png" } }, { "title": "Ajax 教程", "url": "https://www.runoob.com/ajax/ajax-tutorial.html", "image": { "large": "https://static.runoob.com/images/mix/ajaxbig.png", "small": "https://static.runoob.com/images/icon/ajax.png" } }, { "title": "Python 教程", "url": "https://www.runoob.com/pyhton/pyhton-tutorial.html", "image": { "large": "https://static.runoob.com/images/mix/pythonbig.png", "small": "https://static.runoob.com/images/icon/python.png" } }] } }); </script>