为什么这里的单选按钮可以双选？我可以同时选定男女两个选项
如题,求解答。谢谢
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>:radio表单选择器</title>
<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js" type="text/javascript"></script>
<link href="style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<h3>将表单中单选按钮设为不可用</h3>
<form id="frmTest" action="#">
<input type="button" value="Input Button" /><br />
<input id="Radio1" type="radio" />
<label for="Radio1">
男</label>
<input id="Radio2" type="radio" />
<label for="Radio2">
女</label><br />
<button>
Button</button><br />
</form>
<script type="text/javascript">
?.attr("disabled","true");
</script>
</body>
</html>
