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//监听鼠标移动
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window.addEventListener('mousemove', (event) => {
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  mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
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  mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;
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});
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function animate(){
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  requestAnimationFrame(animate);
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  const t = clock.getElapsedTime();
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  if(model) {
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    // 呼吸轻微上下
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    model.position.y = 0.4 + Math.sin(t * 1.2) * 0.02;
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    // 身体微晃
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    model.rotation.z = Math.sin(t * 0.6) * 0.015;
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    // 鼠标跟随注视
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    model.rotation.y = Math.PI + mouse.x * 0.12;
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    model.rotation.x = mouse.y * 0.08;
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  }
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  renderer.render(scene, camera);
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}