为什么加了按钮后网页不会自动关闭了
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>close()</title>
<script type="text/javascript">
function rec(){
var mywin=window.open("http://www.imooc.com");
setTimeout("mywin.close()",1000);
}
</script>
</head>
<body>
<input name="button" type="button" onClick="rec()" value = "点击查看网页" />
</body>
</html>