                        课程
                    
                        /前端开发
                        
                            /JavaScript
                        
                        /JavaScript入门篇

我的为什么点不动呢？

<!DOCTYPE HTML>
<html>
    <head>
        <title>hello javascript</title>
        <meta http-equiv="Content-Type" content="text/html charset=utf-8">
        <script type="text/javascript">
            function open(){
                var isok=confirm("是否打开这个窗口?");
                if(isok==true){
                    var url=prompt("请你输入网址");
                    if(url!=null){
                        window.open(' http：//www.imooc.com/','_blank','width=400,height=500,menubar=no,toolbar=no');
                    }else{
                        alert("再见");
                    }
                }else{
                    alert("再见");
                }
            }
        </script>
    </head>
    <body>
        <input type="button" name="button" value="javascript" onClick="open">
    </body>
</html>