js 利用iframe 局部打印

function myPrint(){
	var el = "";
	var iframe = document.createElement('IFRAME');
	iframe.setAttribute('style', 'position:absolute;width:0px;height:0px;left:-500px;top:-500px;');
	document.body.appendChild(iframe);
	var doc = iframe.contentWindow.document;
	doc.write(el);
	var ys="html,body{height:100%}img{max-width:100%;max-height:100%;margin:0 auto}";
	var style=document.createElement("style");
	style.innerText=ys;
	doc.getElementsByTagName("head")[0].appendChild(style)
	doc.close();
	iframe.contentWindow.focus();
	iframe.contentWindow.print();
)

感谢文章：https://www.cnblogs.com/30go/p/9788990.html