html
<script src="path/to/halfCircleGauge.js"></script>
<div id = 'target'></div>javascript
var target = document.getElementById('target');
var halfCircleGauge = new HalfCircleGauge().create(target);requireJS
require(['path/to/circleGauge.js'], function (Gauge) {
var target = document.getElementById('test');
var circleGauge = new Gauge().create(target);
});