Method destroy

src/openlayers/overlay/theme/Theme.js:137–150

* @function Theme.prototype.destroy * @description 释放资源，将引用资源的属性置空。

()

     * @description 释放资源，将引用资源的属性置空。
     */
    destroy() {
        this.EVENT_TYPES = null;
        this.isBaseLayer = null;
        this.TFEvents = null;
        this.destroyFeatures();
        this.features = null;
        if (this.renderer) {
            this.renderer.dispose();
        }
        this.renderer = null;
        this.levelRenderer = null;
        this.movingOffset = null;
        this.currentMousePosition = null;
    }

    /**
     * @function Theme.prototype.destroyFeatures