vue-cli創建的項目utils/index.js代碼如下exports.install = function (Vue, options) {     Vue.prototype.test= function () {                 JSON.stringify({})                 console.log('執行成功')     } };main.js代碼如下import commonFun from './utils/index'Vue.use(commonFun)瀏覽器報錯 exports is not defined控制臺報錯 export 'default' (imported as 'commonFun') was not found in './utils/index'刪除 JSON.stringify ，無異常！問題已經解決，根據@gaoryrt回答那樣，改寫如下，it work!export default {     install(Vue, options)  {         Vue.prototype.Utils = {             funA(o) {                 ...             },             funB(o) {                 ...             }         }     } }