如何将对象状态恢复为初始状态？

Question

我有一个对象：

export class ObjectLayer {
   id: number;
   name: string;
}

我从服务器中获取并将其设置为currentVersion

public currentVersion: ObjectLayer;

setVersion(object: ObjectLayer) {
   this.currentVersion = object;
}

然后用户可以更改currentVersion版本。如何随时将版本恢复到初始版本？

Answer 1

保存初始状态。

private _oldVersion?: ObjectLayer;
public currentVersion: ObjectLayer;

setVersion(object: ObjectLayer) {
   this._oldVersion = this.currentVersion;
   this.currentVersion = object;
}

restoreVersion() {
    if (!this._oldVersion) throw new Error('Nothing to restore');
    this.currentVersion = this._oldVersion;
    this._oldVersion = undefined;
}