Vue 模板或渲染 function 未定义

Question

我的网站上的 Vue 渲染有问题。 我已经从github下载了一些论坛应用程序，我在安装它时遇到了一些困难，因为 npm 并没有真正更新，应用程序是 2 年前的。 我设法用 package.json 解决了有关 npm 的所有问题，例如：

"devDependencies": {
        "axios": "^0.18.1",
        "bootstrap": "^4.4.1",
        "cross-env": "^5.2.1",
        "jquery": "^3.5.0",
        "laravel-mix": "^5.0.4",
        "lodash": "^4.17.15",
        "popper.js": "^1.16.1",
        "resolve-url-loader": "^3.1.1",
        "sass-loader": "^8.0.2",
        "vue": "2.5.21",
        "vue-template-compiler": "2.5.21"
    },
    "dependencies": {
        "laravel-echo": "^1.7.0",
        "node-sass": "^4.13.1",
        "pusher-js": "^4.4.0",
        "vue-loader": "15.5.1",
        "vue-router": "^3.1.6",
        "vue-simplemde": "^1.0.4",
        "vuetify": "^1.5.24"
    }

但现在问题出在渲染 vue 上：

app.js:71622 [Vue 警告]：无法安装组件：模板或渲染 function 未定义。

这是 app.js 的样子：

require('./bootstrap');

window.Vue = require('vue');
import Vue from 'vue'
import Vuetify from 'vuetify'
import VueSimplemde from 'vue-simplemde'
import 'simplemde/dist/simplemde.min.css'


Vue.use(Vuetify)
Vue.use(VueSimplemde)
import md from 'marked'
window.md = md;

import User from './Helpers/User'
window.User = User

import Exception from './Helpers/Exception'
window.Exception = Exception

window.EventBus = new Vue();

/**
 * Next, we will create a fresh Vue application instance and attach it to
 * the page. Then, you may begin adding components to this application
 * or customize the JavaScript scaffolding to fit your unique needs.
 */

Vue.component('AppHome', require('./components/AppHome.vue'));
import router from './Router/router.js'

const app = new Vue({
    el: '#app',
    router
});

Answer 1

您收到该错误是因为您的应用根本没有指定渲染模板， new Vue()缺少名为Render Function的render选项。

这将包含应用程序在最重要的地方工作所需的最低 HTML： <div id="app"></div>是必需的，因为设置为#app的el选项告诉 Vue 它应该将其自身安装到哪个 html 元素渲染时。

为实例提供模板的最常见方法是拥有一个专用组件，该组件将是应用程序顶级 html 布局的所在地，但最低要求如下：

// App.vue

<template>

  <div id="app"></div>

</template>

// app.js

import Vue from 'vue'
import App from './App.vue' // <-- MAIN TEMPLATE
import router from './router'

const app = new Vue({
  el: '#app',
  render: h => h(App), // <-- REGISTER MAIN TEMPLATE
  router
});

However since this source appears to be a Laravel Project, clearly the HTML is in a blade template rendered server side and I always find Laravel rendering Vue components server side to be a wonkey concept, I prefer an SPA with Laravel Acting as an API.

也许这个资源会帮助https://vuejsdevelopers.com/2017/11/06/vue-js-laravel-server-side-rendering/