Method destroyFeatures

src/openlayers/overlay/theme/Theme.js:157–171

* @function Theme.prototype.destroyFeatures * @description 销毁要素。 * @param {Array. |FeatureVector} features - 将被销毁的要素。

(features)

     * @param {Array.<FeatureVector>|FeatureVector} features - 将被销毁的要素。
     */
    destroyFeatures(features) {
        var all = (features == undefined);
        if (all) {
            features = this.features;
        }
        if (features) {
            this.removeFeatures(features);
            if (!Array.isArray(features)) {
              features = [features];
            }
            for (var i = features.length - 1; i >= 0; i--) {
                features[i].destroy();
            }
        }
    }

    /**
     * @function Theme.prototype.setOpacity