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>