1.10版本以前的DataTables使用fnReloadAjax （http://www.datatables.net/plug-ins/api/fnReloadAjax）

1.10版本以后使用ajax.url()andajax.reload()就好了。

DataTables 1.10 provides theajax.url()andajax.reload()
methods,built-in,to give the same functionality as this plug-in. As such
this method is marked deprecated,but is available for use with legacy
version of DataTables. Please use the new API if you are used DataTables 1.10
or newer.