Method delLayer

src/common/overlay/levelRenderer/Painter.js:495–510

* @function LevelRenderer.Painter.prototype.delLayer * @description 删除指定层。 * * @param {string} zlevel - 层所在的 zlevel。

(zlevel)

     * @param {string} zlevel - 层所在的 zlevel。
     */
    delLayer(zlevel) {
        var layer = this._layers[zlevel];
        if (!layer) {
            return;
        }
        // Save config
        this.modLayer(zlevel, {
            position: layer.position,
            rotation: layer.rotation,
            scale: layer.scale
        });
        layer.dom.parentNode.removeChild(layer.dom);
        delete this._layers[zlevel];

        this._zlevelList.splice(new Util().indexOf(this._zlevelList, zlevel), 1);
    }


    /**