我正在学习three.js，现在遇到了一个问题需要帮助。看起来很简单，但是我没有找到一个好的答案。问题是：即使声明了使用OrbitControls.js（代码1），即使它显示在DOM的THREE树中（图1）。当我尝试使用构造函数（代码2）时，会收到错误提示：“TypeError: THREE.OrbitControls不是构造函数”（图2）。
CODE1 :***index.html***
<html>
<head>
<title>My first three.js app</title>
<style>
body { margin: 0; }
canvas { width: 100%; height: 100% }
</style>
</head>
<body>
<script src="js/libs/three.min.js"></script>
<script src="js/cena.js"></script>
<script src="js/libs/AxisHelper.js"></script>
<script src="js/libs/GridHelper.js"></script>
<script src="js/libs/OrbitControls.js"></script>
</script>
</body>
</html>
CODE2***:cena.js***
var cena = new THREE.Scene();
var camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 1000 );
var renderizador = new THREE.WebGLRenderer({antialias:true});
renderizador.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderizador.domElement );
//----------------------------
var geometry = new THREE.BoxGeometry( 3, 1, 2 );
var material = new THREE.MeshBasicMaterial( { color: 0x00ff00 } );
var cube = new THREE.Mesh( geometry, material );
var axisHelper = new THREE.AxisHelper( 5 );
cena.add( axisHelper )
var tamanho = 10;
var elementos = 10;
var grid = new THREE.GridHelper(tamanho,elementos);
cena.add(grid);
cena.add( cube );
camera.position.z = 10;
camera.position.y = 10;
camera.position.x = 5;
var lookat_vector = new THREE.Vector3(0,0,0);
camera.lookAt(lookat_vector);
//++++++++++++++++++++++++++++++++++++++++++++++++++++++
var controle = new THREE.OrbitControls(camera, renderizador.domElement);
var render = function () {
requestAnimationFrame( render );
controle.update();
cube.rotation.x += 0.01;
cube.rotation.y +=0.01;
cube.rotation.z +=0.03;
renderizador.render(cena, camera);
//controle.update();
};
render();
