define(['jquery','vue'],function($,Vue){   Vue.component('comp1',function(resolve){     require(['component/comp1'],resolve);   });   Vue.component('comp2',function(resolve){     require(['component/comp2'],resolve);   });   var b = new Vue({     el:"#app",     data:{       currentView:'comp1'     },     methods:{       toggleView:function(){         console.log(this.currentView);         this.currentView = this.currentView=='comp1'?'comp2':'comp1';       }     }   }); }) 

<div id="app">     <keep-alive><!-- 使用keep-alive可以讓動態被切出去的組件繼續保存在內存中（只是隱藏看不到），卻回來之后會繼續之前的狀態和數據 -->     <component v-bind:is="currentView"></component>     </keep-alive>     <button type="button" v-on:click="toggleView">切換view</button>   </div>