dist/bower_components/log4js/log4js/src/main/js/log4js.js
function(appender) {
		if (appender instanceof Log4js.Appender) {
			appender.setLogger(this);
			this.appenders.push(appender);			
		} else {
			throw "Not instance of an Appender: " + appender;
		}
	}
function(appender) {
		if (appender instanceof Log4js.Appender) {
			appender.setLogger(this);
			this.appenders.push(appender);			
		} else {
			throw "Not instance of an Appender: " + appender;
		}
	}
function ( appender ) { if ( appender instanceof Log4js . Appender ) { appender . setLogger ( this ) ; this . appenders . push ( appender ) ; } else { throw "Not instance of an Appender: " + appender ; } }
add additional appender. DefaultAppender always is there.
@param appender additional wanted appender
add additional appender . DefaultAppender always is there .