javascript - Node 用户模型获取 TypeError : Cannot set property 'getUserId' of undefined

Question

我正在尝试创建一个用户模型，但我得到:

2018-12-18 09:47:07.567 [error]: uncaughtException: Cannot set property 'getUserId' of undefined TypeError: Cannot set property 'getUserId' of undefined

这是模型:

var User = (userId, name, lastname) => {
    this.userId = userId;
    this.name = name;
    this.lastname = lastname;
    this.tokenizeSingle = null;
    this.tokenizeFile = null;
    this.detokenizeSingle = null;
    this.detokenizeFile = null;
}

User.prototype.getUserId = () => {
    return this.userId;
}

User.prototype.getName = () => {
    return this.name;
}

User.prototype.getLastname = () => {
    return this.name;
}

User.prototype.getFullName = () => {
    return this.name + ' ' + this.lastname;
}

User.prototype.getTokenizeSingle = () => {
    return this.tokenizeSingle;
}

User.prototype.getTokenizeFile = () => {
    return this.tokenizeFile;
}

User.prototype.getDetokenizeSingle = () => {
    return this.detokenizeSingle;
}

User.prototype.getDetokenizeFile = () => {
    return this.detokenizeFile;
}

User.prototype.setPermissions = (tokenizeSingle, tokenizeFile, detokenizeSingle, detokenizeFile) => {
    this.tokenizeSingle = tokenizeSingle || null;
    this.tokenizeFile = tokenizeFile || null;
    this.detokenizeSingle = detokenizeSingle || null;
    this.detokenizeFile = detokenizeFile || null;
}

module.exports = User;

我也在使用 VS Code，当我这样做时它没有提示任何内容:var newUser = new User(1, 'Rand', 'Fisk'); 在 中放一个点newUser 不显示原型(prototype)中设置的任何选项。

我错过了什么？

Answer 1

箭头函数没有自己的 this 上下文。更改为常规功能，它应该可以工作:

function User(userId, name, lastname) {
    this.userId = userId;
    this.name = name;
    this.lastname = lastname;
    this.tokenizeSingle = null;
    this.tokenizeFile = null;
    this.detokenizeSingle = null;
    this.detokenizeFile = null;
}

User.prototype.getUserId = function() {
    return this.userId;
}