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function datacheck() {
  input1.target="preview";
input1.action="print.asp";
var win = window.open("about:blank","preview","directorys=no,toolbar=no,status=no,menubar=no,scrollbars=no,resizable=no,width=700,height=550,top="+(window.screen.height-550)/2+",left="+(window.screen.width-700)/2+"");
win.focus();
input1.submit();
}
<input type ="submit" value="´òÓ¡Ô¤ÀÀ(Alt+p)"  accesskey="p"  onClick="datacheck();">

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function datacheck() {
  input1.target="preview";
input1.action="print.aspx";
var win = window.open("about:blank","preview","directorys=no,toolbar=no,status=no,menubar=no,scrollbars=no,resizable=no,width=700,height=550,top="+(window.screen.height-550)/2+",left="+(window.screen.width-700)/2+"");
win.focus();
input1.submit();
}
<form id="form1" method="post" runat="server" >
  <asp:Button ID="btn_submit" runat="server" Text="´òÓ¡Ô¤ÀÀ(Alt+p)" AccessKey="p" OnClick="datacheck();" />

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<asp:Button ID="btn_submit&