How to access HTML 5 data-value attribute using JavaScript and jQuery

    <table id="table1">
        <tr>
            <td>
                <span datavalue="1|*~|1">
                    <input id="ChkCompList_0" type="checkbox" name="ChkCompList$0" /><label for="ChkCompList_0">MOSL-BSE-CASH</label></span>
            </td>
            <td>
                <span datavalue="1|*~|2">
                    <input id="ChkCompList_1" type="checkbox" name="ChkCompList$1" /><label for="ChkCompList_1">MOSL-BSE-DERIVATIVES</label></span>
            </td>
        </tr>
    </table>
    <input type="button" onclick="GetData()" value="Get Data" />
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
    <script type="text/javascript">
        function GetData() {
            $("#table1 span").each(function () {
                alert($(this).attr("DataValue"));
            });
        }
    </script>