Node.js / Express with module.exports and prototype

Question

当我用module.exports导出对象后，试图从对象原型访问函数时，我得到：

TypeError:无法读取未定义的属性"auth"

看起来A.prototype.auth没有与module.exports一起传递，但为什么？

Server.js

'use strict';
var express = require('express');
var app = express();
var bodyParser = require('body-parser');
var AReq = require('./src/apiCall');
var A = AReq("a", "b");
var serverPort = 3000; // Server port
var __apipath = "/api/v1/"; // API path
app.use(bodyParser.json());
// Authentication API route
app.get(__apipath + "auth", function (req, res) {
    return A.Auth;
})
// Server listener setup
app.listen(serverPort, function () {
    console.log('Server has been started on port ' + serverPort);
});
module.exports = app;

/src/apiCall.js

'use strict';
function A(login, password) {
    var options_auth = {
        user: login,
        password: password
    };
}
A.prototype.auth = function () {
    return "test";
};
module.exports = A;

Answer 1

您需要创建一个新的apiCall.js实例，更改

var AReq = require('./src/apiCall');
var A = AReq("a", "b");

带

var AReq = require('./src/apiCall');
var A = new AReq("a", "b");