jquery – 在Firefox上传100％时不会触发Html5 ajax文件上传进度监听器

我通过ajax上传文件并在上传后处理图像.
当我尝试在firefox上通过ajax上传图像文件时,xhr进度事件在上传百分比为100％但文件上传成功时不会触发我的进度功能.

上传进度100％时谷歌浏览器触发,但Firefox没有.

Biriefly我的上传脚本：

$("#uploadbutton").click(function(){
   var xhr=new XMLHttpRequest(),fd=new FormData();

   xhr.upload.addEventListener("loadstart",uploadStart,false);
   xhr.upload.addEventListener("progress",uploadProgress,false);
   xhr.addEventListener("error",uploadFailed,false);

   xhr.open("POST",mainurl+"ajaxupload.PHP");

   $.each($("#upload_input").files,function(i,file){
     fd.append("files_"+i,file);
   });    

  xhr.send(fd);

});

function uploadProgress(event){
   var percentComplete = Math.round(event.loaded * 100 / event.total);
   console.log("pecent ",percentComplete);
}

上传启动时,uploadProgress函数runnig 1次(大部分上传时百分比为80％),但上传时没有触发fnish.

// zero or once
xhr.addEventListener("load",uploadSuccess,false);
function uploadSuccess(event) {
    console.log("Upload successful.");
}

// once
xhr.addEventListener("loadend",uploadComplete,false);
function uploadComplete(event) {
    console.log("All done.");
}