有人可以帮我找出JavaScript错误吗？

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I am trying to change the URL of an image by JavaScript where if it is a mobile it will show this image https://axxelfinance.com/hello1.jpg or if it is a desktop it will show this image https://axxelfinance.com/hello2.png

但是我不知道怎么了，这是行不通的。请帮我。

谢谢。

if (/iPhone|iPad|iPod|Android/i.test(navigator.userAgent)) {
  document.getElementById('img1').src = 'https://axxelfinance.com/hello1.jpg';
  document.getElementById('img1').style.height = '200px';
  document.getElementById('img1').style.width = '250px';
} else {
  document.getElementById('img1').src = 'https://axxelfinance.com/hello2.png';
  document.getElementById('img1').style.height = '300px';
  document.getElementById('img1').style.width = '200px';
}
<div class="container">
  <center>
    <img id="img1" src="https://axxelfinance.com/hello1.jpg" height="200px" width="250px">
  </center>
</div>