如何使用jsPDF将图片放在页面的中心？

<script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.4.0/jspdf.umd.min.js"></script>

var doc = new jsPDF();

var img = new Image();
img.src = 'path/to/image.jpg'; // 替换为你的图片路径
var imgWidth, imgHeight;

img.onload = function() {
  imgWidth = this.width;
  imgHeight = this.height;
};

var pageWidth = doc.internal.pageSize.getWidth();
var pageHeight = doc.internal.pageSize.getHeight();
var xPos = (pageWidth - imgWidth) / 2;
var yPos = (pageHeight - imgHeight) / 2;

doc.addImage(img, 'JPEG', xPos, yPos, imgWidth, imgHeight);

doc.save('output.pdf');