vue动态子组件的两种实现方式

<div id="example">
 <button @click="change">切换页面</button>
 <component :is="currentView"></component>
</div>

<script>
var home = {template:'<div>我是主页</div>'};
var post = {template:'<div>我是提交页</div>'};
var archive = {template:'<div>我是存档页</div>'};
new Vue({
 el: '#example',
 components: {
  home,
  post,
  archive,
 },
 data:{
  index:0,
  arr:['home','post','archive'],
 },
 computed:{
  currentView(){
    return this.arr[this.index];
  }
 },
 methods:{
  change(){
   this.index = (++this.index)%3;
  }
 }
})
</script>

<div id="example">
 <button @click="change">切换页面</button>
 <keep-alive>
  <component :is="currentView"></component> 
 </keep-alive>
</div>

<div id="example">
 <button @click="change">切换页面</button>
 <keep-alive>
  <home v-if="index===0"></home>
  <posts v-else-if="index===1"></posts>
  <archive v-else></archive> 
 </keep-alive>
</div>

<script>
new Vue({
 el: '#example',
 components:{
  home:{template:`<div>我是主页</div>`},
  posts:{template:`<div>我是提交页</div>`},
  archive:{template:`<div>我是存档页</div>`},
 },
 data:{
  index:0,
 },
 methods:{
  change(){
   let len = Object.keys(this.$options.components).length;
   this.index = (++this.index)%len;
  }
 }
})
</script>

<div id="example">
 <button @click="change">切换页面</button>
 <keep-alive>
  <component :is="currentView" @pass-data="getData"></component> 
 </keep-alive>
 <p>{{msg}}</p>
</div>

<script>
new Vue({
 el: '#example',
 data:{
  index:0,
  msg:'',  
  arr:[
   { 
    template:`<div>我是主页</div>`,
    activated(){
     this.$emit('pass-data','主页被添加');
    },
    deactivated(){
     this.$emit('pass-data','主页被移除');
    },    
   },
   {template:`<div>我是提交页</div>`},
   {template:`<div>我是存档页</div>`}
  ],
 },
 computed:{
  currentView(){
    return this.arr[this.index];
  }
 },
 methods:{
  change(){
   var len = this.arr.length;
   this.index = (++this.index)% len;
  },
  getData(value){
   this.msg = value;
   setTimeout(()=>{
    this.msg = '';
   },500)
  }
 }
})
</script>

<!-- 逗号分隔字符串 -->
<keep-alive include="a,b">
 <component :is="view"></component>
</keep-alive>
<!-- 正则表达式 (使用 v-bind) -->
<keep-alive :include="/a|b/">
 <component :is="view"></component>
</keep-alive>
<!-- Array (use v-bind) -->
<keep-alive :include="['a', 'b']">
 <component :is="view"></component>
</keep-alive>

<keep-alive include="home,archive">
  <component :is="currentView"></component> 
 </keep-alive>

 asyncComponents(templateName){
  this.curNavComponents = require(`./components/${templateName}.vue`).default;
}