自己稍微处理一下目录结构

<script setup>// 导入three.js 
import  * as THREE from 'three'// 创建场景
const scene =new THREE.Scene();// 创建相机
const camera =new THREE.PerspectiveCamera(45, //视角window.innerWidth / window.innerHeight, //宽高比0.1, // 近平面1000 // 远平面
);// 创建渲染器
const renderer= new THREE.WebGL1Renderer();
renderer.setSize(window.innerWidth,window.innerHeight);
document.body.appendChild(renderer.domElement);// 创建几何体
const geometry =new THREE.BoxGeometry(1,1,1);
// 创建材质
const material =new THREE.MeshBasicMaterial({color:0x00ff00});
// 创建网络
const cube = new THREE.Mesh(geometry,material);// 将网格添加到场景中
scene.add(cube);// 设置相机位置
camera.position.z=5;
// 相机默认看向原点
camera.lookAt(0,0,0);// 渲染函数
function animate(){requestAnimationFrame(animate);//旋转cube.rotation.x +=0.01;cube.rotation.y +=0.02;// 渲染renderer.render(scene,camera);
}animate()
</script><template></template><style>
*{margin: 0;padding: 0;
}canvas{display: block;position: fixed;left: 0;top: 0;width: 100vw;height: 100vh;
}</style>

效果: