param1:    param2: 
XH ID CHAR TEXT DATE TIME NUM Operate

Documention:

1, th properties:
   w_index: index to export
   w_align: align to export
   w_export: "false" then not export it
   width: "10%", "100px", "100PX", if not set then use $.bsgrid_export.doExport() third param's settings.colsProperties.width,
                                   all above not set then use $.bsgrid_export.defaults.settings.colsProperties.width

2, how to get column name:
   $.trim($('th').eq(n).text())

3, url request params names, global setting
   to modify that: $.bsgrid_export.defaults.requestParamsName.X = '', X may exportFileName, colNames, colIndexs, colWidths, colAligns

4, settings.colWidthPercentmultiplier
   if set column width N%, then column width will reset N*colWidthPercentmultiplier.