使用 TypeScript / Angular2 循环对象的键/值 [重复]

Question

如何使用 TypeScript 迭代对象并能够访问键和值？

我的 json 对象看起来像这样：

{
    "clients": {
        "123abc": {
            "Forename": "Simon",
            "Surname": "Sample"
        },
        "456def": {
            "Forename": "Charlie",
            "Surname": "Brown"
        }
    }
}

要填充的客户端对象由如下所示的客户端模型组成：

export class ClientModel {
    id:string;
    forename:string;
    surname:string;

    constructor(
        private id:string,
        private forename:string,
        private surname:string
    ) {
        this.id = id;
        this.forename = forename;
        this.surname = surname;
    }
}

Answer 1

给定：

var a = {
    "clients": {
        "123abc": {
            "Forename": "Simon",
            "Surname": "Sample"
        },
        "456def": {
            "Forename": "Charlie",
            "Surname": "Brown"
        }
    }
};

class ClientModel {
    constructor(
        private id:string,
        private forename:string,
        private surname:string
    ) {}
}

这里是如何获取ClientModel对象数组：

var clientList: ClientModel[] = Object.getOwnPropertyNames(a.clients)
    .map((key: string) => new ClientModel(key, a.clients[key].Forename, a.clients[key].Surname));

...这里还有如何获取从string (id) 到ClientModel 的地图：

var clientMap: { [key: string]: ClientModel } = Object.getOwnPropertyNames(a.clients)
    .reduce((map: any, key: string) => {
        map[key] = new ClientModel(key, a.clients[key].Forename, a.clients[key].Surname);
        return map;
    }, {});

---

经过 basarat 的评论并仔细查看Object.keys()，Object.keys 比Object.getOwnPropertyNames() 更适合在这里使用。不同之处在于后者也返回不可枚举的属性。在这种特殊情况下没有实际区别，但应该使代码的意图更加明确。其他一切都保持不变。