等axios返回vue组件再渲染

<template id="temp1">
        <div>
            <ul v-for="item,index in result" >
                <li>
                    <div class="picOpt">
                        <p class="pic">
                            <img :src="item.allPics[0]" alt="">
                        </p>
                        <p class="opt">
                            <span>编辑图片</span>
                            <span :class="[index==0?downArr:upArr]"  @click="action"></span>
                        </p>
                    </div>
                    <div class="txt">
                        <h2>{{item.Title}}</h2>
                        <h3>{{item.Author}}</h3>
                        <h5>{{item.Abstract}}</h5>    
                    </div>
                </li>
            </ul>
        </div>
    </template>
    <!--content start 注意 isloading--> 
<div class="content" id="box"> 25 <component :is="dtemp" :attritem="items" :upArr="upArr" :downArr="downArr" v-if="isloading"></component> 26 </div>

Vue.prototype.$ajax=axios;
var vm=new Vue({
    el:'#box',
    data:{
        upArr:'arr up',
        downArr:'arr down',
        dtemp:'t1',
        url:'dd.json',
        items:[],
        isloading:false
    },    
    created:function(){
        this.getData()
    },
    methods:{
        getData:function(){
            var vm=this
            vm.$ajax.get(this.url)
                 .then(function(response){
                       vm.items=response.data
                      vm.isloading=true;
                      console.log(vm.items)    
                })
    
        }
    },
    components:{
        t1:{
            props:['attritem','upArr','downArr'],
            template:'#temp1',
            data:function () {
                return {
                    result:this.attritem,
                    upArr:this.upArr,
                    downArr:downArr
                }
            },
            methods:{
                action:function(){
                    console.log("hello")
                }
            }
        }
    }
})