The problem of using axios under vue

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beginners, chrome appears

when using axios to process return values

TypeError: Cannot set property "menu" of undefined

error, I don"t know why. The
menu variable I have defined in data.
use mockjs to intercept.
axios part of the code is as follows

response.data.menuconsole
axiosmenu2this.menu

menu2mockjs
chromeconsole:

I don"t know why

Mock.js axios vue.js

Mar.10,2021

then(function(response){
    this.menu =....
})

Change

then(response => {
    this.menu =....
})

returns a string, and the return type needs to be specified as json

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