DeviceButton was setting a duration property on itself, which went against the read only getter of duration (thanks @winstonwolff)

Author: photonstorm

README.md

@@ -277,6 +277,7 @@ If you are an exceptional JavaScript developer and would like to join the Phaser
 * Time.update has been streamlined and the `updateSetTimeout` and `updateRAF` methods merged and duplicate code removed.
 * Time.desiredFpsMult is a pre-calculated multiplier used in Game.update.
 * Time.refresh updates the `Time.time` and `Time.elapsedMS` values and is called automatically by Game.update.
+* DeviceButton was setting a `duration` property on itself, which went against the read only getter of duration (thanks @winstonwolff)
 
 ### Bug Fixes
 

src/input/DeviceButton.js

@@ -64,15 +64,6 @@ Phaser.DeviceButton = function (parent, buttonCode) {
     */
     this.timeDown = 0;
 
-    /**
-    * If the button is down this value holds the duration of that button press and is constantly updated.
-    * If the button is up it holds the duration of the previous down session.
-    * The value is stored in milliseconds.
-    * @property {number} duration
-    * @default
-    */
-    this.duration = 0;
-
     /**
     * @property {number} timeUp - The timestamp when the button was last released.
     * @default
@@ -169,7 +160,6 @@ Phaser.DeviceButton.prototype = {
         this.isDown = true;
         this.isUp = false;
         this.timeDown = this.game.time.time;
-        this.duration = 0;
         this.repeats = 0;
 
         this.event = event;
@@ -278,7 +268,6 @@ Phaser.DeviceButton.prototype = {
         this.isUp = true;
 
         this.timeDown = this.game.time.time;
-        this.duration = 0;
         this.repeats = 0;
 
         this.altKey = false;
@@ -309,7 +298,7 @@ Phaser.DeviceButton.prototype = {
 Phaser.DeviceButton.prototype.constructor = Phaser.DeviceButton;
 
 /**
-* How long the button has been held down.
+* How long the button has been held down for in milliseconds.
 * If not currently down it returns -1.
 * 
 * @name Phaser.DeviceButton#duration