_invoke(sMeth) {
        if (sMeth in this) {
            this[sMeth]();
        }
    }
/**
     * Invoke a method in this instance
     * @param sMeth
     */
Invoke a method in this instance
@param sMeth
Invoke a method in this instance @param sMeth
_invoke(sMeth) {
        if (sMeth in this) {
            this[sMeth]();
        }
    }
_invoke ( sMeth ) { if ( sMeth in this ) { this [ sMeth ] ( ) ; } }
Invoke a method in this instance
 @param sMeth
Invoke a method in this instance @param sMeth