为什么不行
function openWindow()
{var open=confirm("是否打开新窗口?");
if(open==true)
{var open1=prompt("请输入打开的新窗口","http://www.imooc.com");
if(open1!=null)
{window.open(open1,"_blank",'width=400px,height=500px,menubar=no,toolbar=no');}
else{alert("欢迎下次再来");}}
else{alert("欢迎下次再来");}}