Method update

packages/fairygui/src/core/Timer.ts:94–135

* Update timer (called by ECS system each frame) * 更新定时器（每帧由 ECS 系统调用） * * @param deltaMs Delta time in milliseconds | 间隔时间（毫秒）

(deltaMs: number)

     * @param deltaMs Delta time in milliseconds | 间隔时间（毫秒）
     */
    public update(deltaMs: number): void {
        this.delta = deltaMs;
        this.currentTime += deltaMs;
        this.frameCount++;

        this._updating = true;

        // Process timers
        for (const callback of this._callbacks.values()) {
            if (callback.removed) continue;

            callback.elapsed += deltaMs;
            if (callback.elapsed >= callback.interval) {
                callback.callback.call(callback.caller);
                if (callback.repeat) {
                    callback.elapsed = 0;
                } else {
                    callback.removed = true;
                }
            }
        }

        // Clean up removed callbacks
        for (const [id, callback] of this._callbacks) {
            if (callback.removed) {
                this._callbacks.delete(id);
            }
        }

        // Process callLater
        const pending = this._callLaterList;
        this._callLaterList = this._callLaterPending;
        this._callLaterPending = [];

        for (const item of pending) {
            item.callback.call(item.caller);
        }
        pending.length = 0;
        this._callLaterList = pending;

        this._updating = false;
    }

    /**
     * Execute callback after specified delay (one time)