FirefoxOSでモスキート音を鳴らせた

app.js

window.addEventListener("load", function() {
  
  var audio = {
    context: null,
    oscillator: null,
    gainNode: null
  }
  
  function init(){
    audio.context = new AudioContext();
    audio.oscillator = audio.context.createOscillator();
    audio.gainNode = audio.context.createGain();
    audio.oscillator.connect(audio.gainNode);
    audio.gainNode.connect(audio.context.destination);
    audio.oscillator.type = 'square'; // 矩形波
    audio.oscillator.start(0);
  }
  
  init();
             
  function setScale(num){
    var onkai = [
      0,
      261.6255653005986,
      293.6647679174076,
      329.6275569128699,
      349.2282314330039,
      391.99543598174927,
      440,
      493.8833012561241,
      523.2511306011972,
    ];
    audio.oscillator.frequency.value = ( onkai[num]*2 );
  }

  function play(array1,array2){
    var counter1 = 0;
    var counter2 = 0;
    var timerID = 0;
    var StartTimer, StopTimer, Timer;
    StartTimer = function() {
      timerID = setInterval(Timer, 200);
    };
    StopTimer = function() {
      clearInterval(timerID);
    };
    Timer = function() {
      setScale(array1[counter1]);
      counter2++;
      if(counter2 == array2[counter1]){
        counter1++;
        counter2=0;
        if(counter1 == array1.length) StopTimer();
      }
    };
    StartTimer();
  }
  
  ////////////////////////////////////////////////
  play(array1,array2);
  var array1 = [1,2,3,2,1,0,1,2,3,2,1,2,0];
  var array2 = [1,1,2,1,1,1,1,1,1,1,1,3,0];
  
});