var chart1 = new Chart(document.getElementById('chart'), {
type: 'radar',
data: {
labels: ['a', 'b', 'c', 'd', 'e', 'f', 'g'],
datasets: [{
label: 'series1',
data: [1, 2, 3, 6, 3, 2, 4]
}]
},
options: {
scale: {
gridLines: {
color: ['black', 'red', 'orange', 'yellow', 'green', 'blue', 'indigo']
}
}
}
});
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.min.js"></script>
<canvas id="chart"></canvas>