【解决办法】可以自定义展示图例,访问https://iserver.supermap.io/iserver/services/map-jingjin/rest/maps/%E4%BA%AC%E6%B4%A5%E5%9C%B0%E5%8C%BA%E5%9C%9F%E5%9C%B0%E5%88%A9%E7%94%A8%E7%8E%B0%E7%8A%B6%E5%9B%BE/legend.rjson?returnVisibleOnly=true&bbox=114.59%2C37.76%2C119.51%2C42.31获取对应的图例到前端进行展示