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              function init () {
    // 获取浏览器窗口的宽高,后续会用
    var width = window.innerWidth
    var height = window.innerHeight

    // 创建一个场景
    var scene = new THREE.Scene()

    // 创建一个具有透视效果的摄像头
    var camera = new THREE.PerspectiveCamera(45, width / height, 0.1, 800)

    // 创建一个 WebGL 渲染器,Three.js 还提供 <canvas>, <svg>, CSS3D 渲染器。
    var renderer = new THREE.WebGLRenderer()

    // 设置渲染器的清除颜色(即背景色)和尺寸
    renderer.setClearColor(0xffffff)
    renderer.setSize(width, height)
    
    // Three.js 提供很多种辅助函数(helper),它有助于调试
    // 创建坐标轴(RGB颜色 分别代表 XYZ轴)
    var axisHelper = new THREE.AxisHelper(6)

    // 将立方体网格加入到场景中
    scene.add(axisHelper)

    // 设置摄像机位置,并将其朝向场景中心
    camera.position.x = 10
    camera.position.y = 10
    camera.position.z = 30
    camera.lookAt(scene.position)

    // 将渲染器的输出(此处是 canvas 元素)插入到 body
    document.body.appendChild(renderer.domElement)

    // 渲染,即摄像头拍下此刻的场景
    renderer.render(scene, camera)
}
init()
            
          
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