Vue3.0全局变量使用

3.0之前的写法

import Vue from 'vue'
import App from './App.vue'
import Keycloak from 'keycloak-js'
....
Vue.prototype.$keycloak = keycloak

3.0的写法

import { createApp } from 'vue'
import App from './App.vue'
import Keycloak from 'keycloak-js'
····
const app = createApp(App);
app.config.globalProperties.$keycloak= keycloak
.....

参考：
https://www.cnblogs.com/IsSshuai/p/14086445.html
https://www.5axxw.com/questions/content/nsd3mq