关闭弹出窗口的问题

Question

<script>
   var c=window.open("http://www.google.com","google")
</script>
<input type=button value="关闭" onclick="c.close();">

Answer 1

<button onclick="openwindow();">Open a new Window</button>
<button onclick="closethewindow();">Close the window</button>
<script language="JavaScript" type="text/javascript">
<!--
var oWindow = null;function openwindow(){
oWindow = window.open("http://localhost");
}function closethewindow(){
if(oWindow != null){
oWindow.opener = null;
oWindow.close();
oWindow = null;
}
}
//-->
</script>