ajax select ¶¯Ì¬¸ü¸Ä optionÖµ

<pre name="code" class="javascript">    $("#citysid").change(function() {
        var cityNo = $(this).val();
        var TOKEN = $('meta[name="csrf-token"]').attr("content");
        var data = {
            cityNo: cityNo,
            _token: TOKEN
        };
        html = "";
        $.ajax({
            type: 'post',
            url: '/cityNo',
            data: data,
            success: function(res) {
                console.log(res.data);
                var len = res.data.length;
                for (var i = 0; i < len; i++) {


                    html = html + "<option value='" + res.data[i].id + "' >" + res.data[i].title + "</option>";
                }
                $("#drugstoresid").html("");
                $("#drugstoresid").append(html);


            },
            dataType: 'json'
        });
    });