                        课程
                    
                        /前端开发
                        
                            /JavaScript
                        
                        /JavaScript入门篇

求大神，帮我解答一下我的哪错了，感激不尽！

<!DOCTYPE html>
<html>
<head>
<title> new document </title>
<meta http-equiv="Content-Type" content="text/html; charset=gbk"/>
<script type="text/javascript">
    function rec(){
        var mac=confirm("是否打开新窗口");
        if(mac==ture)
        {
            var url=prompt("输入对话框，打开新窗口","http://www.imooc.com");
            if(url!=null)
            {
             window.open(url,'_blank','width=400,height=500,menubar=no,toolbar=no');
            }
        else
        {
            alert("再见");
        }
    }
        else
        {
          alert("再见");
        }
    }
    rec();
</script>
</head>
<body>
   <input type="button" value="新窗口打开网站" onclick="rec()" />
</body>
</html>