WS2812B LED strip and ESP8266 shows wrong colors

Hi! I finally got Espruino running on my ESP8266 12-E NodeMCU, but I'm having some issues talking to my strip correctly. When I was controlling my strip using Arduino and C before, I hooked up the data pin to RX, which worked just fine. Now I'm (apparently) supposed to hook it up to D2, or any of the pins near it, but the colors are all wrong.

When I do something like:

require("neopixel").write(NodeMCU.D2, [255, 0, 0]);

The first LED shines 70% yellow 30% green, if I do [0, 255, 0] it's 90% white 10% purple, and if I do [0, 0, 255] it's 80% white 20% blue (something like that).

It's not red, green, or blue as it's supposed to be. Any clue why?

Oh, and I also tried this:

require("ESP8266").neopixelWrite(NodeMCU.D2, [255,0,0]);

but that yields the same result.

EDIT: I found this code in another post, which actually works fine:

E.setClock(80);
var i = 0;
var esp8266 = require("ESP8266");
function colorLeds(red, green, blue) {
  var data = [];
  for (var i=0; i<3; i++) {
    data.push(green);
    data.push(red);
    data.push(blue);
  }
  console.log(data);
  esp8266.neopixelWrite(NodeMCU.D2, data);
}
setInterval(function() {
  i++;
  if ((i % 3) === 0) {
      colorLeds(255,0,0);
  } else if ((i%3) === 1) {
      colorLeds(0,255,0);
  } else {
      colorLeds(0,0, 255);
  }
}, 1000);

BUT! If I simply comment out the setInterval() and just write colorLeds(255, 0, 0) they all shine with a purple hue. What on earth???