Method addEntityToIndexes

packages/core/src/ECS/Core/QuerySystem.ts:256–270

* 将实体添加到各种索引中

(entity: Entity)

     * 将实体添加到各种索引中
     */
    private addEntityToIndexes(entity: Entity): void {
        // 标签索引
        const tag = entity.tag;
        if (tag !== undefined) {
            const tagSet = this._entityIndex.byTag.get(tag) || this.createAndSetTagIndex(tag);
            tagSet.add(entity);
        }

        // 名称索引
        const name = entity.name;
        if (name) {
            const nameSet = this._entityIndex.byName.get(name) || this.createAndSetNameIndex(name);
            nameSet.add(entity);
        }
    }

    private createAndSetTagIndex(tag: number): Set<Entity> {
        const set = new Set<Entity>();