Question

我正在研究从typescript es6到javascript es6的节点应用程序。我使用inversify将类依赖注入到适当的类中。当我尝试使用this运算符访问成员变量时，我收到以下错误：＆＃34; TypeError：无法读取属性＆＃39; organizationMemberRepository＆＃39;未定义＆＃34;。我注意到在转到箭头功能并删除了＆＃34;那=＆＃34;后，我开始收到这个错误。逻辑，我在docker容器中运行节点。这是已转换的javascript文件：

"use strict";
let OrganizationMemberService = class OrganizationMemberService {
    constructor(organizationRepository, organizationMemberRepository, authorizationService) {
        this.authenticateUser = (userName, password) => {
            return new Promise(function (resolve, reject) {
                console.log('about to check if user exists.....');
                this.organizationMemberRepository.findMemberByUserName(userName)
                    .then(function (organizationMember) {
                        if (organizationMember) {
                            organizationMember.comparePassword(password)
                                .then(function (same) {
                                    if (same) {
                                        let returnedObj = JSON.parse(JSON.stringify(organizationMember));
                                        resolve(returnedObj);
                                    }
                                    else {
                                        reject(new genericerror_1.GenericError("You username/password combination is incorrect."));
                                    }
                                })
                                .catch(function (err) {
                                    reject(err);
                                });
                        }
                        else {
                            reject(new genericerror_1.GenericError("You username/password combination is incorrect."));
                        }
                    });
            });
        };

        this.organizationRepository = organizationRepository;
        this.organizationMemberRepository = organizationMemberRepository;
        this.authorizationService = authorizationService;
    }
};
OrganizationMemberService = __decorate([
    inversify_1.injectable(),
    __param(0, inversify_1.inject(types_1.TYPES.IOrganizationRepository)), __param(1, inversify_1.inject(types_1.TYPES.IOrganizationMemberRepository)), __param(2, inversify_1.inject(types_1.TYPES.IAuthorizationService)),
    __metadata("design:paramtypes", [Object, Object, Object])
], OrganizationMemberService);
exports.OrganizationMemberService = OrganizationMemberService;

我认为es6 arrow运营商想要解决无法正确访问此运营商问题的问题？

Answer 1

您需要将所有.then(function () {语法更改为.then(()=> { 在this正常工作之后，请参阅下面的更改

let OrganizationMemberService = class OrganizationMemberService {
    constructor(organizationRepository, organizationMemberRepository, authorizationService) {
        this.authenticateUser = (userName, password) => {
            return new Promise( (resolve, reject) => {
                console.log('about to check if user exists.....');
                this.organizationMemberRepository.findMemberByUserName(userName)
                    .then( (organizationMember) => {
                        if (organizationMember) {
                            organizationMember.comparePassword(password)
                                .then( (same) => {
                                    if (same) {
                                        let returnedObj = JSON.parse(JSON.stringify(organizationMember));
                                        resolve(returnedObj);
                                    }
                                    else {
                                        reject(new genericerror_1.GenericError("You username/password combination is incorrect."));
                                    }
                                })
                                .catch((err) => {
                                    reject(err);
                                });
                        }
                        else {
                            reject(new genericerror_1.GenericError("You username/password combination is incorrect."));
                        }
                    });
            });
        };

        this.organizationRepository = organizationRepository;
        this.organizationMemberRepository = organizationMemberRepository;
        this.authorizationService = authorizationService;
    }
};

es6 arrow函数在转换为javascript

1 个答案: