Arduino Parts

Hi,

So I just received my pH Meter and shield from df, however, I am running into a little trouble converting the library to JS. I have taken the Arduino code from here[http://www.dfrobot.com/wiki/index.php/PH_meter(SKU:_SEN0161)], but I can't seem to find an equivalent to "millis();". Is there a way around this? Am I even going in the right direction?

Thanks.

function SEN0161(pin) {
  this.pin = pin;
}

SEN0161.prototype.getScale = function () {
  pin = this.pin;
  var val = digitalRead(pin);
  
  var Offset = 0.00;
  var LED = 13;
  var samplingInterval = 20;
  var printInterval = 800;
  var ArrayLength = 40;
  
  var pHArray = [ArrayLength];
  var pHArrayIndex = 0;
  var samplingTime = '';
  
  var printTime = Date.now();
  var pHValue,voltage;
  
  //console.log(Date.now());
  //console.log(digitalPulse(this.pin,1,5));

  if(Date.now() - samplingTime > samplingInterval) {
      pHArray[pHArrayIndex++] = analogRead(this.pin);
    
      if(pHArrayIndex == ArrayLenth)pHArrayIndex=0;
    
      voltage = this.averageArray(pHArray, ArrayLength) * 5.0 / 1024;
      pHValue = 3.5 * voltage + Offset;
      samplingTime = Date.now();
  }
  if(Date.now() - printTime > printInterval) {
        console.log("Voltage:");
        console.log(voltage,2);
        console.log("    pH value: ");
        console.log(pHValue,2);
        digitalWrite(LED,digitalRead(LED)^1);
        printTime = Date.now();
  }
};

SEN0161.prototype.averageArray = function (arr, number) {
  var i;
  var max,min;
  var avg;
  var amount=0;

  if(number <= 0){
    console.log("Error number for the array to avraging!/n");
    return 0;
  }
  if(number < 5) {   //less than 5, calculated directly statistics
    for(i=0; i < number; i++) {
      amount += arr[i];
    }
    avg = amount/number;
    return avg;
  } else {
    console.log(arr);
    if(arr[0] < arr[1]) {
      min = arr[0]; max=arr[1];
    } else {
      min=arr[1];
      max=arr[0];
    }
    console.log(min);
    console.log(max);
    for(i=2; i < number; i++) {
      if(arr[i] < min) {
        amount += min;        //arr<min
        min = arr[i];
      } else {
        if(arr[i] > max) {
          amount += max;    //arr>max
          max = arr[i];
        } else {
          amount += arr[i]; //min<=arr<=max
        }
      }
    }
    avg = amount/(number-2);
  }
  return avg;
};

exports.connect = function (pin) {
  return new SEN0161(pin);
};

//exports.connect();


var sensor = exports.connect(A1);
console.log(sensor);
//console.log(sensor.getScale());
setInterval('sensor.getScale()', 1000);