Method begin

packages/core/src/ECS/Scene.ts:462–477

* 开始场景，启动实体处理器等 * * 这个方法会启动场景。它将启动实体处理器等，并调用onStart方法。 * 在编辑器模式下，此方法还会执行所有延迟的组件生命周期回调。 * * This method starts the scene. It will start entity processors and call onStart. * In editor mode, this method also executes all deferred component lifecycle callbacks.

()

     * In editor mode, this method also executes all deferred component lifecycle callbacks.
     */
    public begin() {
        this._didSceneBegin = true;

        if (this._deferredComponentCallbacks.length > 0) {
            for (const callback of this._deferredComponentCallbacks) {
                try {
                    callback();
                } catch (error) {
                    this._logger.error('Error executing deferred component callback:', error);
                }
            }
            this._deferredComponentCallbacks = [];
        }

        this.onStart();
    }

    /**
     * 结束场景，清除实体、实体处理器等