vue用axios时报错：Cannot read property 'protocol' of

Question

import Vue from 'vue'import Vuex from 'vuex'import axios from 'axios'Vue.use(Vuex)Vue.use(axios)报错信息：isURLSameOrigin.js?cf95:57 Uncaught (in promise) TypeError: Cannotread property 'protocol' of undefinedat isURLSameOrigin (eval at <anonymous> (app.js:929), <anonymous>:57:21)at dispatchXhrRequest (eval at <anonymous> (app.js:754), <anonymous>:108:50)at Promise (<anonymous>)at xhrAdapter (eval at <anonymous> (app.js:754), <anonymous>:12:10)at dispatchRequest (eval at <anonymous> (app.js:866), <anonymous>:52:10)报错截图：但是，通过原型方式使用就正常：import Vue from 'vue'import Vuex from 'vuex'import axios from 'axios'Vue.use(Vuex)Vue.prototype.$ajax = axios