                        课程
                    
                        /前端开发
                        
                            /JavaScript
                        
                        /JavaScript入门篇

大神们，求助我这段代码没有弹出 confirm ??

<!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 open=confirm("确认在新窗口打开网站吗？");
        if(open==true)
        {
           var url=prompt("请输入网址"，"http://www.immoc.com");
           if(url!=null)
               {
                  window.open(url,"_blank","width=400,height=500,menubar=no,toolbar=no");
               }
              else
              {
                  alert("再见！");
              }
         }
        else
        {
           alert("再见！");
        }
}

   </script>
</head>
<body>
   <input type="button" value="打开新网址" onclick="openwindow()">

</body>
</html>