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js vr实现

2026-03-14 03:02:49JavaScript

VR 实现的基本方法

使用 JavaScript 实现 VR（虚拟现实）通常依赖于 WebXR API 或第三方库（如 A-Frame、Three.js）。以下是几种常见方法：

WebXR API 现代浏览器支持 WebXR API，可以直接通过 JavaScript 调用设备传感器和 VR 硬件。以下是一个简单的 WebXR 示例：

navigator.xr.isSessionSupported('immersive-vr').then((supported) => {
  if (supported) {
    const canvas = document.createElement('canvas');
    document.body.appendChild(canvas);
    const gl = canvas.getContext('webgl', { xrCompatible: true });

    navigator.xr.requestSession('immersive-vr').then((session) => {
      session.updateRenderState({ baseLayer: new XRWebGLLayer(session, gl) });
      session.requestAnimationFrame(onXRFrame);
    });
  }
});

function onXRFrame(time, frame) {
  const session = frame.session;
  const pose = frame.getViewerPose(referenceSpace);
  if (pose) {
    for (const view of pose.views) {
      renderView(view);
    }
  }
  session.requestAnimationFrame(onXRFrame);
}

A-Frame 框架 A-Frame 是基于 Three.js 的声明式 VR 框架，适合快速开发：

<!DOCTYPE html>
<html>
  <head>
    <script src="https://aframe.io/releases/1.2.0/aframe.min.js"></script>
  </head>
  <body>
    <a-scene>
      <a-box position="-1 0.5 -3" rotation="0 45 0" color="#4CC3D9"></a-box>
      <a-sphere position="0 1.25 -5" radius="1.25" color="#EF2D5E"></a-sphere>
      <a-cylinder position="1 0.75 -3" radius="0.5" height="1.5" color="#FFC65D"></a-cylinder>
      <a-plane position="0 0 -4" rotation="-90 0 0" width="4" height="4" color="#7BC8A4"></a-plane>
      <a-sky color="#ECECEC"></a-sky>
    </a-scene>
  </body>
</html>

Three.js 实现 Three.js 提供更底层的 VR 控制：

import * as THREE from 'three';
import { VRButton } from 'three/examples/jsm/webxr/VRButton.js';

const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
const renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.xr.enabled = true;
document.body.appendChild(VRButton.createButton(renderer));
document.body.appendChild(renderer.domElement);

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

camera.position.z = 5;

renderer.setAnimationLoop(function() {
  cube.rotation.x += 0.01;
  cube.rotation.y += 0.01;
  renderer.render(scene, camera);
});

设备兼容性检查

确保设备支持 VR 功能：

js vr实现

if ('xr' in navigator) {
  navigator.xr.isSessionSupported('immersive-vr').then((supported) => {
    console.log(supported ? 'VR supported' : 'VR not supported');
  });
}