ajax 请求回的json数据实时写入html

<script type="text/javascript" charset="utf-8">
            var myForm;
            var feedbackAddDialog;
            function clock() {
                $.ajax({
                    type: "POST",
                    url: 'feedbackAction!findFive.action',
                    dataType: 'json',
                    success: function(msg) {
                        $("#feedbackList").empty(); //清空原有网页内容
                        for (var i = 0; i < msg.length; i++) {
                            //创建行
                            var tr = document.createElement("tr");
                            //给奇偶行添加样式
                            if (i % 2 == 0) tr.setAttribute("class", "even");
                            else tr.setAttribute("class", "odd");
                            //创建列
                            var td0 = document.createElement("td");
                            //给列添加样式
                            td0.setAttribute("class", "thehead");
                            //序号
                            var va2 = document.createTextNode(i + 1);
                            td0.appendChild(va2);
                            tr.appendChild(td0);
                            //创建title列
                            var td2 = document.createElement("td");
                            td2.setAttribute("class", "thetd");
                            td2.setAttribute("title", msg[i].title);
                            var str = msg[i].title;
                            if (str.length > 20) {
                                str = str.substring(0, 12) + "...";
                            }
                            var val = document.createTextNode(str);
                            td2.appendChild(val);
                            tr.appendChild(td2);
                            //创建content列
                            var td3 = document.createElement("td");
                            td3.setAttribute("class", "thetd");
                            td3.setAttribute("title", msg[i].content);
                            var content = msg[i].content;
                            if (content.length > 20) {
                                content = content.substring(0, 45) + "...";
                            }
                            var val2 = document.createTextNode(content);
                            td3.appendChild(val2);
                            tr.appendChild(td3);

                            var td4 = document.createElement("td");
                            td4.setAttribute("class", "thetd");
                            var time = document.createTextNode(msg[i].createDt);
                            td4.appendChild(time);
                            tr.appendChild(td4);
                            document.getElementById("feedbackList").appendChild(tr);
                        }
                    }
                });
            }
            $(function() {
                clock();
                setInterval("clock()", 1000 * 60); //每分钟发送一次请求
            });
            $(document).ready(function() {

                $('#title').validatebox({
                    required: true
                });

                $('#content').validatebox({
                    required: true
                });

                myForm = $('#feedbackAddForm').form({
                    url: 'feedbackAction!add.action',
                    success: function(data) {
                        var json = $.parseJSON(data);
                        if (json && json.success) {
                            window.messageshow('成功', json.msg);
                            $('#title').val("");
                            $('#content').val("");
                            feedbackAddDialog.close();
                        } else {
                            window.messageshow('失败', '操作失败!');
                            feedbackAddDialog.close();
                        }
                    }
                });

                feedbackAddDialog = $('#feedbackAddDialog').show().dialog({
                    title: '添加意见反馈',
                    modal: true,
                    closed: true,
                    maximizable: true,
                    buttons: [{
                        text: '添加',
                        handler: function() {
                            $('#feedbackAddForm').submit();
                        }
                    }]
                });

                $("#addFeedback").click(function() {
                    feedbackAddDialog.dialog('open')
                });

            });
        </script>
        <div style="overflow: auto;height:150px;">
            <table class="pageList" cellspacing="0" style="width:98%;">
                <thead>
                    <tr>
                        <td width="30" class="thehead">
                            <button class="sys-btn" style="width:30px;" id="addFeedback">
                                <b></b>反馈
                            </button>
                        </td>
                        <td align="center" width="30" class="thehead">标题</td>
                        <td align="center" class="thehead">内容</td>
                        <td width="30" class="thehead" align="center">
                            时间
                        </td>
                    </tr>
                </thead>
                <tbody id="feedbackList">
                </tbody>
            </table>
        </div>
        <div id="feedbackAddDialog" style="display: none;width: 500px;height: 300px;"
        align="center">
            <form id="feedbackAddForm" method="post">
                <table cellpadding="0" cellspacing="0" align="center">
                    <tr>
                        <td valign="top" height="auto">
                            <table cellpadding="0" cellspacing="0" style="width:100%;">
                                <tbody>
                                    <tr height="50px">
                                        <td width="80" height="50" align="right">
                                            标题：
                                        </td>
                                        <td colspan="3" width="360">
                                            <input type="text" style="width:100%;border: 1px solid; #99cccc;" name="title"
                                            id="title" maxlength="50" missingMessage="请填写标题" />
                                        </td>
                                    </tr>
                                    <tr>
                                        <td width="80" align="right">
                                            内容：
                                        </td>
                                        <td colspan="3">
                                            <textarea rows="8" name="content" id="content" maxlength="300" style="width:100%; border: 1px solid; #00ccff"
                                            missingMessage="请填写内容">
                                            </textarea>
                                        </td>
                                    </tr>
                                </tbody>
                            </table>
                        </td>
                    </tr>
                </table>
            </form>
        </div>