<!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("打开新窗口");
if(open == true){
var url = prompt("请输入要打开的网站网址","http://www.imooc.com");
if(url!=null){
widow.open(url,'_blank','width = 400px,height = 500px,menubar = null,toolbar = null');
}
else{
alert("你选择了取消");
}
}
</script>
</head>
<body>
<input type="button" value="新窗口打开网站" onclick="openWindow()" />
</body>
</html>
function函数最后面少了一个大括号，window.open（）打错了