Openlayers示例: http://develop.smaryun.com:81/API/JS/OL5InterfaceDemo/index.htm
IGServer API文档: http://develop.smaryun.com:81/API/JS/IGS%20JavaScript%20API%20v02/index.htm
Openlayers文档: https://openlayers.org/en/latest/apidoc/
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