t1.htm
<head>
<title>1</title>
</head>
<body>
<a href="t2.htm" target="_blank">2</a>
</body>
</html>
t2.htm
<head>
<title>2</title>
<script>
alert(window.opener);
if(window.opener != null)
{
alert("aa");
}
</script>
</head>
<body>
2
</body>
</html>
必须得有target="_blank"这个属性才管用