1. 动态组件
<!DOCTYPE html>
< html >
< head >
< meta charset = "utf-8" >
< style >
#app {
font-size: 0
}
.dynamic-component-demo-tab-button {
padding: 6px 10px;
border-top-left-radius: 3px;
border-top-right-radius: 3px;
border: 1px solid #ccc;
cursor: pointer;
margin-bottom: -1px;
margin-right: -1px;
background: #f0f0f0;
}
.dynamic-component-demo-tab-button.dynamic-component-demo-active {
background: #e0e0e0;
}
.dynamic-component-demo-tab-button:hover {
background: #e0e0e0;
}
.dynamic-component-demo-posts-tab {
display: flex;
}
.dynamic-component-demo-tab {
font-size: 1rem;
border: 1px solid #ccc;
padding: 10px;
}
.dynamic-component-demo-posts-sidebar {
max-width: 40vw;
margin: 0 !important;
padding: 0 10px 0 0 !important;
list-style-type: none;
border-right: 1px solid #ccc;
line-height: 1.6em;
}
.dynamic-component-demo-posts-sidebar li {
white-space: nowrap;
text-overflow: ellipsis;
overflow: hidden;
cursor: pointer;
}
.dynamic-component-demo-active {
background: lightblue;
}
.dynamic-component-demo-post-container {
padding-left: 10px;
}
.dynamic-component-demo-post > :first-child {
margin-top: 0 !important;
padding-top: 0 !important;
}
</ style >
< script src = "https://cdn.jsdelivr.net/npm/vue/dist/vue.js" ></ script >
</ head >
< body >
< div id = "app" >
< button v-for = "tab in tabs" class = "dynamic-component-demo-tab-button"
v-bind:class = "{'dynamic-component-demo-active': tab === currentTab}"
@ click = "currentTab = tab" >{{ tab }}</ button >
< keep-alive >
< component v-bind:is = "currentTabComponent" ></ component >
</ keep-alive >
</ div >
< script >
Vue.component('tab-posts', {
data: function(){
return {
posts: [
{id: 1, title: 'Cat Ipsum', content: 'Cont wait for the storm to pass, ...'},
{id: 2, title: 'Hipster Ipsum', content: 'Bushwick blue bottle scenester ...'},
{id: 3, title: 'Cupcake Ipsum', content: 'Icing dessert souffle ...'},
],
selectedPost: null
}
},
template: `< div class = "dynamic-component-demo-posts-tab dynamic-component-demo-tab" >
< ul class = "dynamic-component-demo-posts-sidebar" >
< li v-for = "post in posts"
v-bind:key = "post.id"
v-on:click = "selectedPost = post"
v-bind:class = "{'dynamic-component-demo-active': post===selectedPost}" >
{{ post.title }}
</ li >
</ ul >
< div class = "dynamic-component-demo-post-container" >
< div v-if = "selectedPost" class = "dynamic-component-demo-post" >
< h3 >{{ selectedPost.title }}</ h3 >
< div v-html = "selectedPost.content" ></ div >
</ div >
< strong v-else>
Click on a blog title to the left to view it.
</ strong >
</ div >
</ div >`
});
Vue.component('tab-archive', {
template: '< div class = "dynamic-component-demo-tab" >Archive component</ div >'
});
new Vue({
el: '#app',
data: {
currentTab: 'Posts',
tabs: ['Posts', 'Archive']
},
computed: {
currentTabComponent: function(){
return 'tab-' + this.currentTab.toLowerCase()
}
}
});
</ script >
</ body >
</ html >
在动态组件上使用keep-alive，可以在组件切换时保持组件的状态，避免了重复渲染的性能问题。
2.异步组件
Vue 允许你以一个工厂函数的方式定义你的组件，这个工厂函数会异步解析你的组件定义。
Vue.component( 'async-example' , function (resolve, reject) {})
这里可以回顾一下 Vue.js — 组件基础 。
我们使用通过webpack打包的Vue项目来介绍异步组件。
<!-- HelloWorld.vue -->
< template >
< div >
< h2 class = "title" >{{msg}}</ h2 >
</ div >
</ template >
< script >
export default {
data () {
return {
msg: 'Hello Vue!'
}
}
}
</ script >
<!-- Add "scoped" attribute to limit CSS to this component only -->
< style scoped>
.title {
padding: 5px;
color: white;
background: gray;
}
</ style >
<!-- App.vue -->
< template >
< div id = "app" >
< HelloWorld />
</ div >
</ template >
< script >
import HelloWorld from './components/HelloWorld'
export default {
name: 'App',
components: {
HelloWorld
}
}
</ script >
< style >
</ style >
我们把App.vue的<script>标签里面的内容改为：
export default {
name: 'App' ,
components: {
HelloWorld: () => import( './components/HelloWorld' )
}
}
这样就实现了App组件异步加载HelloWorld组件的功能。
我们可以实现按需加载。
<!-- App.vue -->
< template >
< div id = "app" >
< button @ click = "show = true" >Load Tooltip</ button >
< div v-if = "show" >
< HelloWorld />
</ div >
</ div >
</ template >
< script >
export default {
data: () => ({
show: false
}),
components: {
HelloWorld: () => import('./components/HelloWorld')
}
}
</ script >
< style >
</ style >
这里的异步组件工厂函数也可以返回一个如下格式的对象：
const AsyncComponent = () => ({
// 需要加载的组件 (应该是一个 `Promise` 对象)
component: import( './MyComponent.vue' ),
// 异步组件加载时使用的组件
loading: LoadingComponent,
// 加载失败时使用的组件
error: ErrorComponent,
// 展示加载时组件的延时时间。默认值是 200 (毫秒)
delay: 200,
// 如果提供了超时时间且组件加载也超时了，
// 则使用加载失败时使用的组件。默认值是：`Infinity`
timeout: 3000
})
参考：
动态组件 & 异步组件 — Vue.js
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原文链接：https://www.cnblogs.com/gzhjj/p/11792692.html
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