opacity: Number

Sets opacity of crosshair.

Default: 1
Example: .1, .5, etc. 
var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
 axisY:{
	crosshair: {
		enabled: true,
		opacity: .5
	}
	
   },
 .
 . 
});
chart.render();
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