bootstrapfileinput实现文件上传功能

$('#txt_file').fileinput('upload');

function initFileInput(ctrlName, uploadUrl) {
  var cOntrol= $('#' + ctrlName);
  control.fileinput({
   language: 'zh', //设置语言
   uploadUrl: uploadUrl, //上传的地址
   allowedFileExtensions : ['txt', 'doc','docx'],//接收的文件后缀
   showUpload: false, //是否显示上传按钮
   showCaption: false,//是否显示标题
   enctype: 'multipart/form-data',
   browseClass: "btn btn-primary", //按钮样式    
   previewFileIcon: "",
   uploadExtraData: function() { //额外参数的关键点
     return data;
    }
   }).on("fileuploaded", function (event, data, previewId, index) {
    fileResponseData.push(data.response.Attach);
   });
 }
 
 //-----入口方法-----
 $(function() {
  initFileInput("txt_file", "/updateFile.do");
 });