<!DOCTYPE html>
<html>
<head>
<title> new document </title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<script type="text/javascript">
function openWindow(){
var openw=confirm("是否打开窗口?")
if (openw==true){
openw=prompt("输入网址:","http://www.imooc.com/");
if(openw!=null){
openw=window.open(openw,"_blank","width=400,height=500,menubar=no,toolbar=no");
}
else{
}
}else{
}
}
// 新窗口打开时弹出确认框,是否打开
// 通过输入对话框,确定打开的网址,默认为 http://www.imooc.com/
//打开的窗口要求,宽400像素,高500像素,无菜单栏、无工具栏。
</script>
</head>
<body>
<input type="button" value="新窗口打开网站" onclick="openWindow()" />
</body>
</html>
openw=prompt("输入网址:","http://www.imooc.com/"); if(openw!=null){ openw=window.open(openw,"_blank","width=400,height=500,menubar=no,toolbar=no"); } 这里openw!=null会出错,在本机调试时发现当输入网址为空时,openw="",代码应该改为 if(openw!="")