diff --git a/example/main.ts b/example/main.ts
index 3c4d036..ff82cec 100644
--- a/example/main.ts
+++ b/example/main.ts
@@ -18,76 +18,79 @@ import trail from './textures/trail.png';
 import particle from './textures/particle.png';
 import { CustomTrailParticleMaterial } from './CustomTrailParticleMaterial';
 
-const canvas = document.getElementById('canvas')!;
-const textureLoader = new TextureLoader();
-const trailTexture = await textureLoader.loadAsync(trail);
-const particleTexture = await textureLoader.loadAsync(particle);
-trailTexture.generateMipmaps = false;
-particleTexture.generateMipmaps = false;
+async function main() {
+  const canvas = document.getElementById('canvas')!;
+  const textureLoader = new TextureLoader();
+  const trailTexture = await textureLoader.loadAsync(trail);
+  const particleTexture = await textureLoader.loadAsync(particle);
+  trailTexture.generateMipmaps = false;
+  particleTexture.generateMipmaps = false;
 
-const scene = new Scene();
-scene.background = new Color(0x123456);
+  const scene = new Scene();
+  scene.background = new Color(0x123456);
 
-const renderer = new WebGLRenderer({ canvas, antialias: true });
-renderer.setPixelRatio(devicePixelRatio);
-renderer.setSize(innerWidth, innerHeight);
+  const renderer = new WebGLRenderer({ canvas, antialias: true });
+  renderer.setPixelRatio(devicePixelRatio);
+  renderer.setSize(innerWidth, innerHeight);
 
-const camera = new PerspectiveCamera(60, innerWidth / innerHeight, 0.1, 100);
-camera.position.set(0, 0, 20);
+  const camera = new PerspectiveCamera(60, innerWidth / innerHeight, 0.1, 100);
+  camera.position.set(0, 0, 20);
 
-// const control = new OrbitControls(camera, canvas);
-// control.enableDamping = true;
+  // const control = new OrbitControls(camera, canvas);
+  // control.enableDamping = true;
 
-const YAxis = new Object3D();
-const ZAxis = new Object3D();
-const box = new Mesh(new BoxGeometry(1, 1), new MeshLambertMaterial({ color: 0xffffff }));
-const trailBox = new Trail(undefined, new CustomTrailMaterial(trailTexture));
-// 或者
-// const trailBox = new Trail(
-//   undefined,
-//   new TrailMaterial({
-//     uniforms: { map: { value: trailTexture } },
-//     vertexShader: CustomTrailMaterial.VERT,
-//     fragmentShader: CustomTrailMaterial.FRAG,
-//    }),
-// );
-const trailLine = new Trail(undefined, new CustomTrailMaterial(trailTexture));
-const trailParticle = new TrailParticle(
-  { size: 1, velocity: 2 },
-  new CustomTrailParticleMaterial(particleTexture, new Color(0xffc107)),
-);
-box.position.x = 5;
-trailBox.position.x = 5;
-trailParticle.position.x = 5;
-trailBox.scale.setScalar(0.25);
-box.visible = false;
-// trailBox.visible = false;
-// trailParticle.visible = false;
-// trailLine.visible = false;
-ZAxis.add(box, trailBox, trailParticle);
-YAxis.add(ZAxis);
-scene.add(YAxis, camera, trailLine);
-scene.add(new AmbientLight(0xffffff, 0.2));
-camera.add(new DirectionalLight(0xffffff, 1));
+  const YAxis = new Object3D();
+  const ZAxis = new Object3D();
+  const box = new Mesh(new BoxGeometry(1, 1), new MeshLambertMaterial({ color: 0xffffff }));
+  const trailBox = new Trail(undefined, new CustomTrailMaterial(trailTexture));
+  // 或者
+  // const trailBox = new Trail(
+  //   undefined,
+  //   new TrailMaterial({
+  //     uniforms: { map: { value: trailTexture } },
+  //     vertexShader: CustomTrailMaterial.VERT,
+  //     fragmentShader: CustomTrailMaterial.FRAG,
+  //    }),
+  // );
+  const trailLine = new Trail(undefined, new CustomTrailMaterial(trailTexture));
+  const trailParticle = new TrailParticle(
+    { size: 1, velocity: 2 },
+    new CustomTrailParticleMaterial(particleTexture, new Color(0xffc107)),
+  );
+  box.position.x = 5;
+  trailBox.position.x = 5;
+  trailParticle.position.x = 5;
+  trailBox.scale.setScalar(0.25);
+  box.visible = false;
+  // trailBox.visible = false;
+  // trailParticle.visible = false;
+  // trailLine.visible = false;
+  ZAxis.add(box, trailBox, trailParticle);
+  YAxis.add(ZAxis);
+  scene.add(YAxis, camera, trailLine);
+  scene.add(new AmbientLight(0xffffff, 0.2));
+  camera.add(new DirectionalLight(0xffffff, 1));
 
-window.addEventListener('resize', () => {
-  camera.aspect = innerWidth / innerHeight;
-  camera.updateProjectionMatrix();
-  renderer.setSize(innerWidth, innerHeight);
-});
+  window.addEventListener('resize', () => {
+    camera.aspect = innerWidth / innerHeight;
+    camera.updateProjectionMatrix();
+    renderer.setSize(innerWidth, innerHeight);
+  });
 
-const speed = 0.04;
-const renderLoop = () => {
-  ZAxis.rotation.z += speed;
-  YAxis.rotation.y += speed * 0.35;
-  trailLine.position.y += 0.3;
-  if (trailLine.position.y > 10) {
-    trailLine.position.y = -10;
-    trailLine.reset();
-  }
-  renderer.render(scene, camera);
-  requestAnimationFrame(renderLoop);
-  // setTimeout(renderLoop, 256);
-};
+  const speed = 0.04;
+  const renderLoop = () => {
+    ZAxis.rotation.z += speed;
+    YAxis.rotation.y += speed * 0.35;
+    trailLine.position.y += 0.3;
+    if (trailLine.position.y > 10) {
+      trailLine.position.y = -10;
+      trailLine.reset();
+    }
+    renderer.render(scene, camera);
+    requestAnimationFrame(renderLoop);
+    // setTimeout(renderLoop, 256);
+  };
 
-renderLoop();
+  renderLoop();
+}
+main();