Method removeRelation

packages/fairygui/src/core/GObject.ts:672–674

* Remove a relation * 移除关联

(target: GObject, relationType: ERelationType)

     * 移除关联
     */
    public removeRelation(target: GObject, relationType: ERelationType): void {
        this._relations?.remove(target, relationType);
    }

    // Gear | 齿轮