JavaScript通过window.opener向父窗口输出内容

<!DOCTYPE html>
<html>
<head>
<script>
function openWin()
{
myWindow=window.open('','','width=200,height=100');
myWindow.document.write("<p>This is 'myWindow'</p>");
myWindow.focus();
myWindow.opener.document.write("<p>This is the source window!</p>");
}
</script>
</head>
<body>
<input type="button" value="Open 'myWindow'" onclick="openWin()" />
</body>
</html>