用jquery获取复选框属性值

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <script type="text/javascript" src="jquery-1.8.0.js"></script>
    </head>
    <body>
        <input type="checkbox" id="1" value="gdragon" />gdragon<br />
        <input type="checkbox" id="2" value="sun" />sun<br />
        <input type="submit" id="tijiao" value="提交" />
    </body>

    <script type="text/javascript">
        $(document).ready(function(){
            var checked = [];
            $("#tijiao").click(function(){
                $('input:checkbox:checked').each(function() {
                    checked.push($(this).attr('id'));
                });
                alert(checked);
                checked = [];
            });
        });
    </script>
</html>


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