polygon strokecolor

HTML

<script src="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraphcore.js"></script>
<link rel="stylesheet" href="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraph.css">
<div id="box" class="jxgbox" style="width: 500px; height: 500px;"></div>

JavaScript

var i, pol,
    board = JXG.JSXGraph.initBoard('box', {boundingbox: [-10, 10, 10, -10]}),
    coords = [
        [-4, 4],
        [4, 4],
        [0, 0],
        [-4, -4]
    ],
    p = [];


for (i = 0; i < coords.length; i++) {
    p.push(board.create('point', coords[i]));
}

pol = board.create('polygon', p, {
    borders: {
        strokeColor: 'pink',
        strokeWidth: 4
    }
});