这个comfirm（）不管是true或者false条件都成立，怎么回事
<!DOCTYPE html>
<html>
<head>
<title> new document </title>
<meta http-equiv="Content-Type" content="text/html; charset=gbk"/>
<script type="text/javascript">
function openWindow(){
var message=confirm("是否打开新窗口？");
if(message=true){
window.open('http://www.imooc.com/','_blank','width=400,height=500,menubar=no,toolbar=no');
}
</script>
</head>
<body>
<input type="button" value="新窗口打开网站" onclick="openWindow()" />
</body>
</html>
