声明原型并在NodeJS的同一文件中使用它

Question

I have created a function that have prototypes which I will use in other files.

function.js

function Graph() {
  //Constructor
  this.Client = null;
}
module.exports = Graph;
Graph.prototype.Init = async function Init() {
      ....
      tokenResult = await GetToken();
};

function GetToken() {
 ...
};

I would use GetToken method outside of the file. so I added GetToken function as prototype

function Graph() {
  //Constructor
  this.Client = null;
}
module.exports = Graph;
Graph.prototype.Init = async function Init() {
      ....
      tokenResult = await GetToken(); <== Error here
};
Graph.prototype.GetToken = function GetToken() {
     ...
};

When I run my program I get this error:

GetToken is not defined

Also I would know how to only export the value of the token and not the function ( so that I could use the same token )

Answer 1

With function expressions like Graph.prototype.GetToken = function GetToken() the name GetToken is only local to the body of the function. So to use it the way you want to, you need to reference this.GetToken() to get the function from the prototype :

 function Graph() { //Constructor this.Client = null; } Graph.prototype.Init = async function Init() { tokenResult = await this.GetToken(); console.log(tokenResult) }; Graph.prototype.GetToken = function GetToken() { return Promise.resolve("GetToken Called") }; g = new Graph() g.Init()