我怎么关闭不了？
<script type="text/javascript">
function rec(){
var mywin = window.open("http://www.imooc.com");
var win = confirm("关闭?");
if(win == true){
mywin.close();
}else{
alert("不关");
}
}
</script>
</head>
<body>
<input name="buton" type="button" value="点击老夫" onclick="rec()" />
</body>
