Ticks

var brd1 = JXG.JSXGraph.initBoard('box1', {originX: 350, originY: 100, unitX: 40, unitY: 40});
var ax1 = brd1.createElement('axis', [[0,0],[1,0]]);
brd1.createElement('ticks',[ax1,0.5], {majorTicks:3,majHeight:80,minHeight:3,strokeColor:'red'});
brd1.createElement('ticks',[ax1,[-2,4.2]], {strokeColor:'black'});
brd1.createElement('ticks',[ax1,function(i){ return (Math.PI);}], {strokeColor:'green',majHeight:120});
brd1.fullUpdate=true; brd1.update(); brd1.fullUpdate=false;