问jQuery DataTables获取选定的行值

EN

 $(document).ready(function() {
 var table = $('#example').DataTable();
 $('#example tbody').on( 'click', 'tr', function () {
    $(this).toggleClass('selected');
} );

$('#button').click( function () {
    alert( table.rows('.selected').data().length +' row(s) selected' );
} );
} );

 <table id="example" class="display" cellspacing="0" width="100%">
    <thead>
        <tr>
            <th>Id</th>
            <th>Position</th>
            <th>Office</th>
            <th>Age</th>
            <th>Start date</th>
            <th>Salary</th>
        </tr>
    </thead>

    <tfoot>
        <tr>
            <th>Id</th>
            <th>Position</th>
            <th>Office</th>
            <th>Age</th>
            <th>Start date</th>
            <th>Salary</th>
        </tr>
    </tfoot>

    <tbody>
        <tr>
            <td>1</td>
            <td>System Architect</td>
            <td>Edinburgh</td>
            <td>61</td>
            <td>2011/04/25</td>
            <td>$320,800</td>
        </tr>
        <tr>
            <td>2</td>
            <td>Accountant</td>
            <td>Tokyo</td>
            <td>63</td>
            <td>2011/07/25</td>
            <td>$170,750</td>
        </tr>
         </table>