Javascript 我的Vuejs应用程序无法使用axios发送http post

在我的Vuejs应用程序中，我试图向我的服务器发送HTTP post，我在控制台中不断收到此错误

TypeError: _api__WEBPACK_IMPORTED_MODULE_0__.default.post is not a function
    at Object.coursePix (services.js?87e7:5)
    at VueComponent._callee$ (testCourse.vue?8c89:98)
    at tryCatch (runtime.js?96cf:45)
    at Generator.invoke [as _invoke] (runtime.js?96cf:271)
    at Generator.prototype.(anonymous function) [as next] (webpack-internal:///./node_modules/regenerator-runtime/runtime.js:97:21)
    at asyncGeneratorStep (asyncToGenerator.js?3b8d:5)
    at _next (asyncToGenerator.js?3b8d:27)
    at eval (asyncToGenerator.js?3b8d:34)
    at new Promise (<anonymous>)
    at new F (_export.js?63b6:36)

这是services.js

import api from '@/api'

export default {
    coursePix (credentials) {
        return api.post('coursePix', credentials)
    }
}

和upload.vue

async AddCourse(){
    const formData = new FormData()
    formData.append('file', formData)
    var obj = {
        send: 'send'
    }
    try{                
        await services.coursePix(obj)
    }
    catch(err){
       console.log(err)
   }
}

---

我尽我所能尝试了一切，但都不起作用，我如何解决这个问题，或者我做错了什么

似乎您没有检索ajax实例：

return api.post('coursePix', credentials)

return api().post('coursePix', credentials)

而不是：

return api().post('coursePix', credentials)