单击“刷新”按钮无反应？

<html>
这是最初的内容<br>
<script language="javascript">
document.write("这是write方法动态写入的内容<br>");
function updatedoc()
{
document.writeIn("abc<br>");
document.writeIn("def<br>");
document.close();
var owin=window.open("","_blank");
owin.document.writeIn("xyz<br>");
owin.document.close();
document.writeIn("abc<br>");
document.writeIn("def<br>");
owin.document.close();
}</script>
<input type=button name="update" value="更新" onclick="updatedoc()">
</html>