使用window.open 打开一个和当前页一样内容的窗口。
var printPreview = window.open('',"_blank","status=0,toolbar=0,location=0,menubar=0,directories=0,scrollbars=1,resizable=1")
var printDocument = printPreview.document;
printDocument.open();
var html = document.documentElement.innerHTML;
printDocument.write("<html>"+html +"</html>");
printDocument.close();
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