Three.js中OrbitControls限制相机旋转方向的解决方案

const camera = new THREE.PerspectiveCamera(75, viewport.offsetWidth / viewport.offsetHeight, 0.01, 20);
camera.position.set(0,1,7);
//修改相机初始角度
camera.rotation.set(0,-Math.PI/2,0);
const controls = new OrbitControls(camera, renderer.domElement);
controls.update();

	const cameraRigY = new THREE.Group();
	scene.add(cameraRigY);

    const camera = new THREE.PerspectiveCamera(75, viewport.offsetWidth / viewport.offsetHeight, 0.01, 20);
	camera.position.set(0,1,7);
    //相机加入组里
	cameraRigY.add(camera);
	//修改整体相机Y轴旋转
	cameraRigY.rotation.set(0,Math.PI/2,0);

	const controls = new OrbitControls(camera, renderer.domElement);
	controls.update();

	controls.target = new THREE.Vector3(0, 0, 0);//控制焦点

     /**
     * Save the current state of the controls. This can later be
     * recovered with .reset.
     */
    saveState(): void;

    /**
     * Reset the controls to their state from either the last time
     * the .saveState was called, or the initial state.
     */
    reset(): void;