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: Cannot
read property 'protocol' of undefined

at isURLSameOrigin (eval at  (app.js:929), :57:21)
at dispatchXhrRequest (eval at  (app.js:754), :108:50)
at Promise ()
at xhrAdapter (eval at  (app.js:754), :12:10)
at dispatchRequest (eval at  (app.js:866), :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