// 场景、相机、光源定义定义
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000000);
var light = new THREE.AmbientLight(0xffffff);
scene.add(light);

// 渲染器定义
var renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.setClearColor(0xffffff);
document.body.appendChild(renderer.domElement);