warning in ./src/plugins/axios.js 「export 『default『 (imported as 『Vue『) was not found in 『vue『

warning in ./src/plugins/axios.js "export 'default' (imported as 'Vue') was not found in 'vue'
解決方法：
https://www.jianshu.com/p/b4d1bcd47da0
試試了幾個都沒有。最乾脆的方法，是直接重新建立 vue工程。記住，建立時一定是選擇vue2.x.不要用 vue3.x

axios檔案如下：

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"use strict";

import Vue from 'vue';
import axios from "axios";

// Full config: https://github.com/axios/axios#request-config
// axios.defaults.baseURL = process.env.baseURL || process.env.apiUrl || '';
// axios.defaults.headers.common['Authorization'] = AUTH_TOKEN;
// axios.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded';

let config = {
// baseURL: process.env.baseURL || process.env.apiUrl || ""
// timeout: 60 * 1000, // Timeout
// withCredentials: true, // Check cross-site Access-Control
};

const _axios = axios.create(config);

_axios.interceptors.request.use(
function(config) {
// Do something before request is sent
return config;
},
function(error) {
// Do something with request error
return Promise.reject(error);
}
);

// Add a response interceptor
_axios.interceptors.response.use(
function(response) {
// Do something with response data
return response;
},
function(error) {
// Do something with response error
return Promise.reject(error);
}
);

Plugin.install = function(Vue, options) {
Vue.axios = _axios;
window.axios = _axios;
Object.defineProperties(Vue.prototype, {
axios: {
get() {
return _axios;
}
},
$axios: {
get() {
return _axios;
}
},
});
};

Vue.use(Plugin)

export default Plugin;