设置图例滚动可以将legend里面type设置为scroll就可以 参考文档[https://echarts.apache.org/zh/option.html#legend.type](https://link.segmentfault.com/?enc=pOK828BC%2BhULivJ7BTfl8w%3D%3D.1ZEMy2IletaNyIe2XgwZJTe4t5nFhQtvVwjux3z24fvlu5rJ6b%2FWdet5YH%2BffQieDCKLAP9pblnlY%2BTRHCyEyA%3D%3D)