無需庫的反應式狀態管理

簡潔強大的狀態處理

<code class="language-javascript">export class State<IState extends Record<string, unknown>> {
    private data = new Map<keyof IState, IState[keyof IState]>();
    private subscribers = new Map<string, ((...args: any[]) => void)[]>();

    set(name: keyof IState, value: IState[keyof IState]): void {
        this.data.set(name, value);
        this.publish(`change:${String(name)}`, value);
    }

    get(name: keyof IState): IState[keyof IState] | undefined {
        return this.data.get(name);
    }

    has(name: keyof IState): boolean {
        return this.data.has(name);
    }

    clear(): void {
        this.data.clear();
        this.publish('clear');
    }

    publish(name: string, ...args: any[]): void {
        this.subscribers.get(name)?.forEach(fn => fn(...args));
    }

    subscribe(name: string, fn: (...args: any[]) => void): void {
        this.subscribers.has(name)
            ? this.subscribers.get(name)!.push(fn)
            : this.subscribers.set(name, [fn]);
    }

    unsubscribe(name: string, fn: (...args: any[]) => void): void {
        if (this.subscribers.has(name)) {
            const idx = this.subscribers.get(name)!.indexOf(fn);
            if (idx > -1) this.subscribers.get(name)!.splice(idx, 1);
        }
    }

    unsubscribeAll(name: string): void {
        this.subscribers.delete(name);
    }
}</code>

資料綁定：真正的響應式

React整合範例

<code class="language-javascript">function UserProfile() {
    const state = new State();

    const [userData, setUserData] = useState({
        name: state.get('name') || '',
        age: state.get('age') || 0
    });

    // 通过状态变化实现自动响应
    state.subscribe('change:name', (newName) => {
        setUserData(prev => ({ ...prev, name: newName }));
    });

    return (
        <div>
            <input type="text" onChange={e => state.set('name', e.target.value)} />
        </div>
    );
}</code>

為什麼它優於響應式函式庫

• 零外部依賴
• 最小化的包體積
• 原生JavaScript效能
• 簡潔直覺的API
• 內建變更追蹤

關鍵響應式原則

1. 狀態變化觸發更新
2. 自動通知訂閱者
3. 無需複雜的流處理
4. 直接、可預測的資料流

結論

響應式並非依賴函式庫。它關乎理解數據如何流動和變化。此實作證明了強大的狀態管理是JavaScript的原生特性。

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