我加了个警告之后自动出现了这个选项
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>close()</title>
<script type="text/javascript">
function myWin(){
var choice=confirm("你想要打开新窗口吗")
if(choice==true)
{window.open("http://www.imooc.com");}
else
{
window.close("http://www.imooc.com");
alert("已关闭");}
}
</script>
</head>
<body>
<form>
<input name="button" type="button" onClick="myWin()" value="打开新窗口">
</form>
</body>
</html>
