想要獲取一個MapServer圖例很簡單只需要在url后加上legend，并告知返回json數據

例如：

獲取服務所有圖層圖例

https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/legend?f=pjson

獲取服務指定圖層圖例

https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/0/legend?f=pjson

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