[]请问老师为什么我按照官网的实例播放音频没反应呢？

(function()

{

	var Sprite       = Laya.Sprite;

	var Stage        = Laya.Stage;

	var Text         = Laya.Text;

	var Event        = Laya.Event;

	var SoundManager = Laya.SoundManager;

	var Browser      = Laya.Browser;

	var Handler      = Laya.Handler;

	var WebGL        = Laya.WebGL;



	//声明一个信息文本

	var txtInfo;



	(function()

	{

		// 不支持WebGL时自动切换至Canvas

		Laya.init(Browser.clientWidth, Browser.clientHeight, WebGL);



		Laya.stage.alignV = Stage.ALIGN_MIDDLE;

		Laya.stage.alignH = Stage.ALIGN_CENTER;



		Laya.stage.scaleMode = "showall";

		Laya.stage.bgColor = "#232628";



		setup();

	})();



	function setup()

	{

		var gap = 10;



		//创建一个Sprite充当音效播放按钮

		var soundButton = createButton("播放音效");

		soundButton.x = (Laya.stage.width - soundButton.width * 2 + gap) / 2;

		soundButton.y = (Laya.stage.height - soundButton.height) / 2;

		Laya.stage.addChild(soundButton);



		//创建一个Sprite充当音乐播放按钮

		var musicButton = createButton("播放音乐");

		musicButton.x = soundButton.x + gap + soundButton.width;

		musicButton.y = soundButton.y;

		Laya.stage.addChild(musicButton);



		soundButton.on(Event.CLICK, this, onPlaySound);

		musicButton.on(Event.CLICK, this, onPlayMusic);

	}



	function createButton(label)

	{

		var w = 110;

		var h = 40;



		var button = new Sprite();

		button.size(w, h);

		button.graphics.drawRect(0, 0, w, h, "#FF7F50");

		button.graphics.fillText(label, w / 2, 8, "25px SimHei", "#FFFFFF", "center");

		Laya.stage.addChild(button);

		return button;

	}



	function onPlayMusic(e)

	{

		console.log("播放音乐");

		SoundManager.playMusic("../../res/sounds/bgm.mp3", 1, new Handler(this, onComplete));

	}



	function onPlaySound(e)

	{

		console.log("播放音效");

		SoundManager.playSound("../../res/sounds/btn.mp3", 1, new Handler(this, onComplete));

	}



	function onComplete()

	{

		console.log("播放完成");

	}

})();