labelFontWeight : String

Sets the font weight of crosshair’s label.

Default: “normal”
Example: “lighter”,”normal”,”bold”,”bolder” 
var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
 axisY:{   
    crosshair:{
	enabled: true,
	labelFontWeight: "bold",
	.
	.
    },
 },
 .
 . 
});
chart.render();
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