function uploadImageFile(){

                 var xhr = new XMLHttpRequest();

                 //定义表单变量

                 var file = document.getElementById('imageFiles').files;

                 //新建一个FormData对象

                 var formData = new FormData();

                 //追加文件数据

                 for(i=0;i<file.length;i++){

                      formData.append("file["+i+"]", file[i]);

                 }     

                 //post方式

                 xhr.open('POST', memberPath + "/backstage/photo/uploadPhoto.json");

                 //发送请求

                 xhr.send(formData);

                 //success回调

                 xhr.onreadystatechange = function(){

                     if ( xhr.readyState == 4 && xhr.status == 200 ) {

                         console.log( xhr.responseText );

                         var data = xhr.responseText;

                         data = JSON.parse(xhr.responseText)

                         if (data.code == 100) {

                             //insertPhotoList(data.userPhotos); 这里传过来的是一个List<model>，做页面逻辑处理的

                         } else if (data.code == 101) {

                             aler('上传图片不符合要求');

                         } else if (data.code == 102){

                             var update_vip_url = 'update_vip_url';

                             alert('您目前是普通会员，图片文件不可超过5M|升级会员可上传更大文件立即升级会员');

                         } else if (data.code == 103) {

                             alert('您目前是VIP会员，图片文件不可超过50M');

                         }

                     }

                 };

                 //设置超时时间

                 xhr.timeout = 100000;

                 xhr.ontimeout = function(event){}

             }

 MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;

 Iterator<String> names = multipartRequest.getFileNames();

 while (names.hasNext()) {

                     String name = (String) names.next();

                     MultipartFile multipartFile = multipartRequest.getFile(name);

 }