function submitRequest(callback) {  var apkFile = document.getElementById("file").files[0];  if (apkFile) {  var fileName = apkFile.name;  var suff = fileName.substring(fileName.lastIndexOf('.') + 1,fileName.length);  if (suff != "apk") {  $.messager.alert("提示", messageCreator("文件格式必须为apk!"));  return;  }  }  var fd = new FormData();  if (apkFile) {  var apkName = apkFile.name;  fd.append("apkName", apkName);  fd.append("apkFile", apkFile);  }  var seq = $('#inputSeq').val();  fd.append("seq", seq);  fd.append("developer", $('#inputDeveloper').textbox('getText'));  fd.append("isTop", $('#inputIsTop').combobox('getValue'));  fd.append("isRecommend", $('#inputIsRecommend').combobox('getValue'));  fd.append("isRelease", $('#inputIsRelease').combobox('getValue'));  fd.append("description", $('#inputDescription').val());  var xhr = new XMLHttpRequest();  xhr.upload.addEventListener("progress", uploadProgress, false);  xhr.open('POST', AppContextPath + "/rest/app/save_app", true);  /*  xhr.onload = function() {  $.messager.alert("提示", "添加成功", null, function() {  window.top.iframeNavigator('ifrmContent','service/app_main.html');  if (callback != null)  callback();    });  };  */  xhr.onreadystatechange = function() {  if(xhr.readyState == 4 && xhr.status == 200){  $.messager.alert("提示", "添加成功", null, function() {  window.top.iframeNavigator('ifrmContent','service/app_main.html');  if (callback != null)  callback();    });  }else if(xhr.readyState == 4&& xhr.status != 200){  var jsonError = eval("(" + xhr.responseText + ")");  var errorType = jsonError.type;  if(errorType == "ApkDuplicate"){  $.messager.alert("提示", "该Apk已经上传!", null, function() {window.top.iframeNavigator('ifrmContent','service/app_main.html');    });  }  }  };  xhr.send(fd);  }  function uploadProgress(evt) {  if (evt.lengthComputable) {  var percentComplete = Math.round(evt.loaded * 100 / evt.total);  document.getElementById('progressNumber').innerHTML = '<font color=red>当前进度:'+percentComplete.toString() + '%</font>';  }  else {  document.getElementById('progressNumber').innerHTML = 'unable to compute';  }  }