[LayaAir 2.0]【官网代码】加载dom音频报错，怎么回事？

package

{

import laya.events.Event;

import laya.net.HttpRequest;

import laya.net.Loader;

import laya.utils.Browser;

public class Main

{

private var AudioContext:Object;

private var audioContext:Object;

private var analyser:Object;

private var audioBufferSourceNode:Object;

public function Main()

{

Laya.init(500,500);

AudioContext =Browser.window.AudioContext || Browser.window.webkitAudioContext;

audioContext = new AudioContext();

analyser = audioContext.createAnalyser();

analyser.fftSize = 256;

Laya.stage.once(Event.CLICK,this,clickHandler);

}

private function clickHandler(e:Object):void

{

var http:HttpRequest = new HttpRequest();

http.on(Event.COMPLETE,this,completeHandler);

http.send("489.mp3","","get",Loader.BUFFER);

}

private function completeHandler(e:Object):void

{

audioContext.decodeAudioData(e,decodeAudioData.bind(this));

}

private function decodeAudioData(buffer:Object):void

{

audioBufferSourceNode = audioContext.createBufferSource();

audioBufferSourceNode.connect(analyser);

analyser.connect(audioContext.destination);

audioBufferSourceNode.buffer = buffer;

audioBufferSourceNode.start(0);

Laya.timer.loop(1,this,this.drawHandler);

}

private function drawHandler():void

{

Laya.stage.graphics.clear();

var dataArray:Uint8Array = new Uint8Array(analyser.frequencyBinCount);

analyser.getByteFrequencyData(dataArray);

var step:int = Math.round(dataArray.length / 60);

for (var i:int = 0; i < 40; i++) {

var energy:int = (dataArray[step * i] / 256.0) * 50;

for (var j:int = 0; j < energy; j++) {

Laya.stage.graphics.drawLine(20 * i + 2, 200 + 4 * j,20 * (i + 1) - 2, 200 + 4 * j,"#ff0000",1);

Laya.stage.graphics.drawLine(20 * i + 2, 200 - 4 * j,20 * (i + 1) - 2, 200 - 4 * j,"#ffff00",1);

}

Laya.stage.graphics.drawLine(20 * i + 2, 200,20 * (i + 1) - 2, 200,"#ff0000",1);

}

}

}

}