legend与图标间隔
echarts自定义tooltip提示框内容
https://blog.csdn.net/dreamsup/article/details/56667330
echarts中自定义提示框 (tooltip.formatter)
https://blog.csdn.net/yijiupingfan0914/article/details/90695289
legend与图标间隔
https://blog.csdn.net/dreamsup/article/details/56667330
https://blog.csdn.net/yijiupingfan0914/article/details/90695289