text: class Constant {
    constructor(options={}) {
      this.OVERLAY_Z_INDEX = options.overlayZIndex || 20;
      this.CLONE_Z_INDEX = this.OVERLAY_Z_INDEX + 1;
      this.TOOLTIP_Z_INDEX = this.CLONE_Z_INDEX + 1;
    }
  
    reload(options={}) {
      this.OVERLAY_Z_INDEX = options.overlayZIndex || 20;
      this.CLONE_Z_INDEX = this.OVERLAY_Z_INDEX + 1;
      this.TOOLTIP_Z_INDEX = this.CLONE_Z_INDEX + 1;
    }
  }
  
  export default new Constant();
  