fix #148 AudioContext.prototype.hasOwnProperty

Author: therewasaguy

src/sndcore.js

@@ -88,13 +88,13 @@ define(function (require) {
         !window.hasOwnProperty('AudioContext')) {
       window.AudioContext = webkitAudioContext;
 
-      if (!AudioContext.prototype.hasOwnProperty('createGain'))
+      if (typeof AudioContext.prototype.createGain !== 'function')
         AudioContext.prototype.createGain = AudioContext.prototype.createGainNode;
-      if (!AudioContext.prototype.hasOwnProperty('createDelay'))
+      if (typeof AudioContext.prototype.createDelay !== 'function')
         AudioContext.prototype.createDelay = AudioContext.prototype.createDelayNode;
-      if (!AudioContext.prototype.hasOwnProperty('createScriptProcessor'))
+      if (typeof AudioContext.prototype.createScriptProcessor !== 'function')
         AudioContext.prototype.createScriptProcessor = AudioContext.prototype.createJavaScriptNode;
-      if (!AudioContext.prototype.hasOwnProperty('createPeriodicWave'))
+      if (typeof AudioContext.prototype.createPeriodicWave !== 'function')
         AudioContext.prototype.createPeriodicWave = AudioContext.prototype.createWaveTable;
 
 
@@ -167,7 +167,7 @@ define(function (require) {
         return node;
       };
 
-      if (AudioContext.prototype.hasOwnProperty( 'createOscillator' )) {
+      if (typeof AudioContext.prototype.createOscillator !== 'function') {
         AudioContext.prototype.internal_createOscillator = AudioContext.prototype.createOscillator;
         AudioContext.prototype.createOscillator = function() {
           var node = this.internal_createOscillator();