vue3.0取消了Vue.prototype，官方文档推荐使用globalProperties
具体用例如下
static.js:

import router from "@/router";

function getStatic(url) {
    return 'http://localhost:81/' + url
}
function linkTo (url, data) {
    router.push({path: url, query: data})
}
export default {
    getStatic,
    linkTo
}

main.js:

import { createApp } from 'vue'
import App from './App.vue'
import getStatic from './network/request/static/static'


const app = createApp(App)
app.config.globalProperties.$http = getStatic

组件中使用:

console.log(this.$http.getStatic("wdadwa"))

可以正常打印