组件可以通过referexternalobject'}newVue({el:'#app-1',data:{currentView:external},methods:{switchCpt:function(){vararr=[external,'home','posts','archive']varindex=arr.indexOf(this.currentView)if(index<4){this.currentView=arr[index+1]}else{this.currentView=arr[0]}}},components:{home:{template:'componenthome'},posts:{template:'componentposts'},存档:{template:'componentarchive'}}})内部保存的组件个数:{{$children.length}}
