为什么我点击按钮没反应
<!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 cof=confirm("是否打开此网页?"); if(cof) { var pro=prompt("确定打开的网址:","www.baidu.com/"); window.open(pro,'_blank','height=500,width=400,menubar=no,toolbar=no'); } } </script> </head> <body> <input type="button" value="新窗口打开网站" onclick="openWindow()" /> </body> </html>