layui里的上传控件问题

<link rel="stylesheet" href="map/plug-in/scripts/layui/css/layui.css" />

<script type="text/javascript" src="map/plug-in/scripts/layui/lay/dest/layui.all.js" ></script>

<div class="layui-form-item query_inp query_inp2">
<div class="layui-input-inline">
  <input type="file" name="file（queryUpload）" class="layui-upload-file layui-upload-file_chaxun">
</div>
</div>

layui.upload({
 elem: '.layui-upload-file_chaxun',
 url: 'importServlet.do'
 ,title: '请上传TXT文件'
 ,ext: 'txt' //那么，就只会支持这三种格式的上传。注意是用|分割。
 ,success: function(res,input){
 }
 });