字符串中的html代码中夹杂了jsp代码，如何独立显示jsp的部分

Question

图片中的圈圈就是我的问题，两个form表单，第二个表单是我动态生成的。生成的代码如下:

if(para.dragDrop){
                // 创建带有拖动的html
                html += '<form id="uploadForm" action="'+para.url+'" method="post" enctype="multipart/form-data">';
                html += '    <div class="upload_box">';
                html += '        <div class="upload_main">';
                html += '            <div class="upload_choose">';
                html += '                <div class="convent_choice">';
                html += '                    <div class="andArea">';
                html += '                        <div class="filePicker">点击选择文件</div>';
                html += '                        <input id="fileImage" type="file" size="30" name="fileselect[]" '+multiple+'>';
                html += '                    </div>';
                html += '                </div>';
                html += '                <span id="fileDragArea" class="upload_drag_area">或者将文件拖到此处</span>';
                html += '            </div>';
                html += '            <div class="status_bar">';
                html += '                <div id="status_info" class="info"></div>';
                html += '                <div class="btns">';
                html += '                    <div class="webuploader_pick">继续选择</div>';
                html += '                    <div class="upload_btn">开始上传</div>';
                html += '                </div>';
                html += '            </div>';
                html += '            <div id="preview" class="upload_preview"></div>';
                html += '        </div>';
                html += '        <div class="upload_submit">';
                html += '            <button type="button" id="fileSubmit" class="upload_submit_btn">确认上传文件</button>';
                html += '        </div>';
                html += '        <div id="uploadInf" class="upload_inf"></div>';
                html += '    </div>';
                
                ***html += '    <input type="hidden" name="userid" value="<%= userid %>"/>';***
                
                html += '</form>';
                

请麻烦看看倒数第二行，我如何才能正确显示已经提前在jsp页面中写好的userid字符串呢？

Answer 1

var userid = 'xxxx';
html += '<input type="hidden" name="userid" value="' + userid + '"/>';