报错提示：

[Vue warn]: Failed to mount component: template or render function not defined.

found in

---> <App> at src/app.vue

       <Root>

相关代码：

app.vue:

    <template>

        <div id='test'>

            {{text}}

        </div>

    </template>

    <script>

        export default {

            data(){

                return{

                    text:'abc'

                }

            }

        }

    </script>

    <style>

    #test{

        color:black;

    }

    </style>

index.js:    

import Vue from 'vue'

import App from './app.vue'

import './assert/style/test.css'

import './assert/image/nn.png'

import './assert/style/test.less'

const root = document.createElement('div')

document.body.appendChild(root)

new Vue({

    render:(h)=>h(App)

}).$mount(root)