Function _fnLog

blockstrap/js/dependencies/tables.js:4813–4838

* Log an error message * @param {object} settings dataTables settings object * @param {int} level log error messages, or display them to the user * @param {string} msg error message * @param {int} tn Technical note id to get more information about the error. * @memberof DataTable#oApi

( settings, level, msg, tn )

	 *  @memberof DataTable#oApi
	 */
	function _fnLog( settings, level, msg, tn )
	{
		msg = 'DataTables warning: '+
			(settings!==null ? 'table id='+settings.sTableId+' - ' : '')+msg;
	
		if ( tn ) {
			msg += '. For more information about this error, please see '+
			'http://datatables.net/tn/'+tn;
		}
	
		if ( ! level  ) {
			// Backwards compatibility pre 1.10
			var ext = DataTable.ext;
			var type = ext.sErrMode || ext.errMode;
	
			if ( type == 'alert' ) {
				alert( msg );
			}
			else {
				throw new Error(msg);
			}
		}
		else if ( window.console && console.log ) {
			console.log( msg );
		}
	}
	
	
	/**