1、新建js文件publicJS.js

//复制一个一模一样的数据 this.clone(复制的数据)
export function clone(data) {
	return JSON.parse(JSON.stringify(data))
}

2、mian.js引入使用

import {
	createSSRApp
} from 'vue'
import App from './App.vue'
//全局js
import * as publicJS from './common/publicJS.js';

export function createApp() {
	const app = createSSRApp(App)
	Object.keys(publicJS).forEach((key) => {
		app.config.globalProperties[key] = publicJS[key]
		
	})
	app.config.globalProperties.myGlobalMethod()
	return {
		app
	}
}