错误
two.js:3390 Uncaught TypeError: Cannot read property 'appendChild' of null
at root.Two.appendTo (two.js:3390)
at test2.html:14
错误发生在 two.js 中的这一行
elem.appendChild(this.renderer.domElement);
这是我的代码
<!DOCTYPE html>
<html>
<head>
<script src="./two.js"></script>
</head>
<body>
<script>
var elem = document.getElementById('draw-shapes');
var params = { width: 285, height: 200 };
var two = new Two(params).appendTo(elem);
var circle = two.makeCircle(72, 100, 50);
circle.fill = '#FF8000';
circle.stroke = 'orangered';
circle.linewidth = 5;
two.update();
</script>
</body>
</html>
我刚开始学习Javascript。这个怎么解决???