vue3 configures global parameters and how to use components

vue2 method

1. Global mounting

Vue.property.xxx

import Vue from "vue";
import axios from "axios";
Vue.prototype.$http= axios;
new Vue({
  router,
  store,
  render: (h) => h(App),
}).$mount("#app");

2. Component use

this.$http.xxx();

vue3 method

1. Global mounting

app.config.globalProperties.xxx

import { createApp } from 'vue'
import App from './App.vue'
import ElementPlus, { ElMessage, ElMessageBox } from 'element-plus'
import 'element-plus/dist/index.css'
const app = createApp(App);
app.config.globalProperties.$messageBox = ElMessageBox;
app.config.globalProperties.$message1 = ElMessage;

2. Component usage

// 引入vue的 getCurrentInstance 方法
import { defineComponent, getCurrentInstance } from "vue";
// 获取当前组件实例
const { appContext } = getCurrentInstance();
// 打印看一下结构
console.log(appContext)

You can already see the mounted $messageBox and $message1 in appContext.config.globalProperties. As for why there is another $message

, we can see a screenshot of the element plus official website

You can see that this is mounted by default for element plus, and we can use it directly. Adding $message1 here is just for demonstration. In fact, you can use the default mount directly.

Complete usage example

// 引入vue的 getCurrentInstance 方法
import { defineComponent, getCurrentInstance } from "vue";
// 获取当前组件实例
const { appContext } = getCurrentInstance();
const globalProxy = appContext.config.globalProperties;
export default defineComponent({
  setup() {
    // 退出登录按钮
    const loginOut = () => {
      globalProxy.$messageBox.confirm("确定退出登录吗？", "提示", {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        })
        .then(() => {
          setTimeout(() => {
            globalProxy.$message1({message: "已退出登录", type: "success"});
            localStorage.removeItem("userInfo");
            router.push("/login");
          }, 200);
        })
        .catch((e) => {
          console.log(e);
        });
    };
	
	 return {
	 	loginOut
 	 }
   }
})

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