创建场景：
this.scene = new THREE.Scene()
this.camera = new THREE.PerspectiveCamera(75, window.innerWidth/window.innerHeight, 0.1, 1000)
this.renderer = new THREE.WebGLRenderer()
this.renderer.setSize(window.innerWidth, window.innerHeight)
document.body.appendChild(renderer.domElement)
this.camera.position.z = 5this.scene = new THREE.Scene
