键值组件动态追加按钮失效如何解决？

<table class="table table-responsive fieldlist">
    <tr>
        <td>ID</td>
        <td>Chinese name</td>
        <td>English name</td>
        <td>Number of pieces</td>
        <td>Volume</td>
        <td>Gross Weight</td>
        <td>Value (USD)</td>
        <td>Operate</td>
    </tr>
    <tr>
        <td colspan="8">
            <a href="javascript:;" class="btn btn-sm btn-success btn-append"><i class="fa fa-plus"></i> Append</a>
        </td>
    </tr>
</table>

<script>
$(document).ready(function() {
    $(document).on('click', '.btn-append', function(event) {
        event.preventDefault();
        $('table.fieldlist').append('<tr'><td>New ID</td><td>New Chinese name</td><td>New English name</td><td>New Number of pieces</td><td>New Volume</td><td>New Gross Weight</td><td>New Value (USD)</td><td><a href="javascript:;" class="btn btn-sm btn-danger btn-remove"><i class="fa fa-times"></i> Remove</a></td></tr>');
    });

    $(document).on('click', '.btn-remove', function(event) {
        event.preventDefault();
        $(this).closest('tr').remove();
    });
});
</script>