// OpenLayers. See https://openlayers.org/
// License: https://raw.githubusercontent.com/openlayers/openlayers/master/LICENSE.md// Version: v4.2.0本文共 197 字，大约阅读时间需要 1 分钟。
// OpenLayers. See https://openlayers.org/
// License: https://raw.githubusercontent.com/openlayers/openlayers/master/LICENSE.md// Version: v4.2.0转载于:https://www.cnblogs.com/Jeely/p/10913546.html