如何打印隐藏的iframe的内容？

var iframe = document.getElementById("myIframe");
var iframeContent = iframe.contentWindow.document;

iframe.style.display = "block";

iframeContent.print();

iframe.style.display = "none";

function printIframeContent(iframeId) {
  var iframe = document.getElementById(iframeId);
  var iframeContent = iframe.contentWindow.document;
  iframe.style.display = "block";
  iframeContent.print();
  iframe.style.display = "none";
}

// 调用示例
printIframeContent("myIframe");