// Define the id of your board in BOARDID
const board = JXG.JSXGraph.initBoard(BOARDID, {
boundingbox: [-1, 5, 5, -1],
axis: true
});
// Create two circles
var p1 = board.create('point', [1, 1]);
var p2 = board.create('point', [3, 0]);
var c1 = board.create('circle', [p1, p2], {strokeWidth:1});
var p3 = board.create('point', [4, 1]);
var p4 = board.create('point', [2, 0]);
var c2 = board.create('circle', [p3, p4], {strokeWidth:1});
// Intersecting curve
var a = board.create('curveintersection', [c1, c2], {
strokeColor: 'red',
strokeWidth:3,
fillColor: 'yellow',
fillOpacity: 0.3,
highlightFillColor: 'blue',
highlightFillOpacity: 0.3,
hasInnerPoints: true
});