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可以让动态被切出去的组件继续保存在内存中（只是隐藏看不到），却回来之后会继续之前的状态和数据 --> 
    <component v-bind:is="currentView"></component> 
    </keep-alive> 
    <button type="button" v-on:click="toggleView">切换view</button> 
  </div>