Something Wrong when wanner get input value using $('input').taginput('items')

[imfht]

$('input').taginput('items') returns like below. Could someone give me a hand?

js like

    <script src="https://cdn.bootcss.com/typeahead.js/0.11.1/typeahead.jquery.min.js"></script>
    <script src="https://cdn.bootcss.com/typeahead.js/0.11.1/bloodhound.min.js"></script>
    <script src="https://cdn.bootcss.com/bootstrap-tagsinput/0.8.0/bootstrap-tagsinput.js"></script>

    <script>
        var citynames = new Bloodhound({
            datumTokenizer: Bloodhound.tokenizers.obj.whitespace('name'),
            queryTokenizer: Bloodhound.tokenizers.whitespace,
            prefetch: {
                url: '/tags',
                filter: function (list) {
                    return $.map(list, function (cityname) {
                        return {name: cityname};
                    });
                }
            }
        });
        citynames.initialize();

        var input_tag = $('input').tagsinput({
            typeaheadjs: {
                name: 'citynames',
                displayKey: 'name',
                valueKey: 'name',
                maxChars: 10,
                source: citynames.ttAdapter()
            }
        });

        function submit_tag() {
            var csrf_token = "xxxx"
            $.ajax({
                url: '/delete_domain',
                type: 'post',
                data: {domain_id: domain, csrf_token: csrf_token},
                success: function (response) {
                    if (response.success == 0) {
                        alert('删除失败，原因：' + response.data);
                    }
                    else {
                        alert('删除成功');
                        location.reload();
                    }
                },
                error: function (response) {
                    alert(response);
                }
            })

        }
    </script>

the input form like

<form>
   <input type="text" value="Amsterdam,Washington" data-role="tagsinput" name="tags"/>
   <button type="button" class="btn-sm btn-primary" style="float: right" onclick="">
   提交
   </button>
</form>

I've googled it but found no result. Could some one help me ?

[imfht]

Stupid me. Solved.
Because of typehead, there is another input tag named tt-input and $('input').taginput('items') select the tt-input.
Solved!