Sorry I did not know the code tags.
Then RTFM
How to use this forum
It seems you are right
SEEMS? I am right.
If I'm telling to the arduino light leds 1234 at minute 1 and after light leds 5678 at minute 2, Do the leds 1234 will still be switch on as 5678 ?
The libiary works by setting the bits in a memory buffer. Unless you specifically wipe that buffer or change those LEDs then they will stay on as you add more calls to pixels.setPixelColor for different LEDs.
Is this code correct ?
No.
pixels.setPixelColor(n=all - ALLWAYSLIGHTON(), 0, 0, 0)
is a nonsense.
To turn off all LEDs use this:-
void wipe(){
for(int i=0;i<NUMPIXELS;i++){
pixels.setPixelColor(i, pixels.Color(0,0,0));
}
}