在visual块，右键Column选择Conditional formatting
举例，比如difference > 0 显示红色，否则<0显示绿色
如何根据 measure 写特定条件来更换背景色呢？
举例：先创建measure ：TY FCST VS AOP Color = if (Data[TY FCST VS AOP] >=0 ,"#ff0000","#66ff33") //红和嫩绿
OTHER REF:https://datacornering.com/power-bi-line-chart-marker-color-conditional-formatting/