                        课程
                    
                        /前端开发
                        
                            /JavaScript
                        
                        /JavaScript入门篇

这个哪出问题了

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>close()</title>
<script type="text/javascript">
function openur1(){
     var mywin=window.open("http://www.baidu.com");
     var mynu=confirm("是否要关闭窗口");
     if（mynu==true)
     {
         mywin.close();
         alter("已关闭");
     }
     else{
         alert("关闭失败");
     }
}

</script>
</head>
<body>
     <input name="button" type="button" onClick="openur1()" value="点击" >
</body>
</html>