JQ 操作样式，单选按钮跟复选框

<!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></title>
    <script src="../Scripts/jquery-1.4.1.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function () {
            $("#getValue").click(function () {
                alert($(":radio[name=gender]:checked").val());
            });
            $("#setValue").click(function () {
                $(":radio[name=gender]").val(["保密"]); //给radio设值（选中）时要添加中括号[]
            });
        });

        /*****选中多个*******/
        $(function () {
            $("#checkBtn").click(function () {
                $(":checkbox").val(["羽毛球", "篮球"]);
            });
        });
    </script>
</head>
<body>
    <input type="radio" value="男" name="gender" />男<br />
    <input type="radio" value="女" name="gender" />女<br />
    <input type="radio" value="保密" name="gender" />保密<br />
    <input type="button" value="取值" id="getValue" />
    <input type="button" value="设置" id="setValue" />
    <br />
    <br />
    <br />
    <input type="checkbox" value="篮球" />篮球
    <input type="checkbox" value="足球" />足球
    <input type="checkbox" value="乒乓球" />乒乓球
    <input type="checkbox" value="冰球" />冰球
    <input type="checkbox" value="羽毛球" />羽毛球
    <input type="checkbox" value="橄榄球" />橄榄球
    <input type="button" id="checkBtn" value="选中多个" />
</body>
</html>