js 打印功能
<html>
<head>
<title>打印测试</title>
<script type="text/javascript">
function printDocument() {
document.all.btnPrint.style.display = 'none';
window.print();
document.all.btnPrint.style.display = '';
}
</script>
</head>
<body>
<div>
打印测试1<br>
打印测试2<br>
打印测试3
</div>
<a id="btnPrint" href="#" onclick=
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