SOURCE

var scene = new THREE.Scene();

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

// 内容
// let plane = new THREE
let geometry = new THREE.BoxGeometry(1, 1, 1);
let material = new THREE.MeshBasicMaterial({ color: 0x00ff00 });
const cube = new THREE.Mesh(geometry, material);
scene.add(cube);

const points = [];
points.push(new THREE.Vector3(- 10, 0, 0));
points.push(new THREE.Vector3(0, 10, 0));
points.push(new THREE.Vector3(10, 0, 0));
geometry = new THREE.BufferGeometry().setFromPoints(points);
material = new THREE.LineBasicMaterial({ color: 0x0000ff });
const line = new THREE.Line(geometry, material);
scene.add(line)

// 相机
var camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight,
    0.1, 1000);
camera.position.set(0, 0, 25);
camera.lookAt(0, 0, 0)

// 动画
var animate = function () {
    // requestAnimationFrame(animate);

    cube.rotation.x += 0.01;
    cube.rotation.y += 0.01;

    renderer.render(scene, camera);
};
animate();

<div>test</div>

body { margin: 0; }
canvas { width: 100%; height: 100% }