使用html2canvas的时候出现Uncaught (in promise) Unable to find element in cloned iframe ？

使用的HTML2canvas和jspdf来实现页面的pdf导出

let div = document.createdElement('div');
div.id = 'pagess';
div.innerHTML="<strong>Hi there!</strong>"
document.body.append(div)
const promise = new Promise((res,rej)=>{
  html2canvas(div,{useCORS:ture}).then(canvas =>{
  const imgData = canvas.toDataURL('image/png');
  const pdf = new JsPDF();
  pdf.addImage(imgData,'png',100,100);
  pdf.save('hellow.pdf');
}).catch(error =>{
   rej(error);
})
})

希望能得到相关的回答