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提交留言一直顯示系統錯誤 是什么原因啊

就是后臺創建了一個網站表單

            {php extract(dr_get_form_post_value('wzly'))}
                <form class="dinggou" onsubmit="return submsg(this);" action="" method="post" myform" id="myform">
                {$form}
                    <input type="text" name="data[title]" required="" id="contacts" class="form-control" placeholder="請輸入聯系人">
                    <input type="text" name="data[shouji]" required="" id="mobile" class="form-control" placeholder="請輸入聯系人手機">
                    <textarea name="data[neirong]" id="content" class="form-controltxt" placeholder="請輸入留言內容"></textarea>
                    {if $is_post_code}
                    <div id="yanzm">
                        <input type="text" name="code" required="" id="checkcode" class="form-control" placeholder="請輸入驗證碼">
                        <img title="點擊刷新" src="{dr_code(120, 35)}">
                    </div>
                    {/if}
<button type="button" onclick="dr_ajax_submit('{dr_now_url()}', 'myform', '2000', '{$rt_url}')" class="btn green"> <i class="fa fa-save"></i> 提交內容</button>
</form>
                        <script>
                            function dr_liuyan() {
                                $.ajax({
                                    type: "POST",
                                    dataType: "json",
                                    data: $("#dr_liuyan").serialize(),
                                    url: "{dr_url('index.php?c=liuyan')}",
                                    success: function(json) {
                                        if (json.code) {
                                            layer.msg(json.msg);
                                        } else {
                                            layer.msg(json.msg);
                                        }
                                    },
                                    error: function(HttpRequest, ajaxOptions, thrownError) {
                                        // alert(HttpRequest.responseText);
                                        layer.msg('發生異常');
                                    }
                                });
                            }
                        </script>
            </div>