页面导航与保持活动
有时你希望将已关闭的组件保留在内存中，为了实现这一点，你应该使用 <keep-alive> 元素：
使用 Javascript：
new Vue({
el: '#app',
data: {
currentPage: 'home',
},
methods: {
switchTo: function(page) {
this.currentPage = page;
}
},
components: {
home: {
template: `<div>
<h2>Home</h2>
<p>{{ homeData }}</p>
</div>`,
data: function() {
return {
homeData: 'My about data'
}
}
},
about: {
template: `<div>
<h2>About</h2>
<p>{{ aboutData }}</p>
</div>`,
data: function() {
return {
aboutData: 'My about data'
}
}
},
contact: {
template: `<div>
<h2>Contact</h2>
<form method="POST" @submit.prevent>
<label>Your Name:</label>
<input type="text" v-model="contactData.name" >
<label>You message: </label>
<textarea v-model="contactData.message"></textarea>
<button type="submit">Send</button>
</form>
</div>`,
data: function() {
return {
contactData: { name:'', message:'' }
}
}
}
}
})
HTML：
<div id="app">
<div class="navigation">
<ul>
<li><a href="#home" @click="switchTo('home')">Home</a></li>
<li><a href="#about" @click="switchTo('about')">About</a></li>
<li><a href="#contact" @click="switchTo('contact')">Contact</a></li>
</ul>
</div>
<div class="pages">
<keep-alive>
<component :is="currentPage"></component>
</keep-alive>
</div>
</div>
CSS：
.navigation {
margin: 10px 0;
}
.navigation ul {
margin: 0;
padding: 0;
}
.navigation ul li {
display: inline-block;
margin-right: 20px;
}
input, label, button {
display: block
}
input, textarea {
margin-bottom: 10px;
}