vue-cil browser console error: Can not read property 'protocol' of undefined

Browser error console:

' Cannot read property ‘protocol’ of undefined'

Screenshot:

Error .png

the reason:

This error is caused by an error introduced axios

Screenshot:

Error introduced .png

That can not be used Vue.use (axios); introduced

How to introduce axios correct?

Look workaround below.

Solution:

Proper use is
Vue.prototype $ axios = axios.;

Screenshot:

Correct posture introduced .png

Thank you for Yu Lan!