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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