JavaScript 打印Web页面指定区域的信息

<html >
<head runat="server">
<title>无标题页</title>
<script type="text/javascript">
function printdiv()
{
var headstr = "<html><head></head><body>";
var footstr = "</body>";
var newstr = document.getElementById("YesPrint").innerHTML;
var oldstr = document.body.innerHTML;
document.body.innerHTML = headstr+newstr+footstr;
window.print();
document.body.innerHTML = oldstr;
return false;
}
function okPrint()
{
if (confirm("您确定要打印成文档吗？")==true)
{
printdiv();
}
else
{
window.close();
}
}
</script>
</head>
<body>
<div id="divMain" >
<div id="YesPrint">
这里是需要打印的信息自己可以根据需要自己设计！！！
</div>
<div id="trbtn">
<table>
<tr>
<td >
<input id="btnSave" type="button" value="打印" class="button" onclick="okPrint();" />
</td>
</tr>
</table>
</div>
</div>
</body>
</html>