为什么这个示例（来自 adobe.com）在 Chrome 中有效，但在 FF 和 IE 中无效？：
不起作用=我可以看到权限窗口，但是当我单击“允许”时，我看到的只是一个空白屏幕。
或查看以下代码：
// frame action
import flash.media.Microphone;
import flash.events.SampleDataEvent;
import flash.utils.ByteArray;
import flash.display.Graphics;
var nWidth:Number = stage.stageWidth;
var nCenter:Number = stage.stageHeight / 2;
var nScale:Number = 100;
var myGraphics:Graphics = graphics;
var my_mic:Microphone = Microphone.getMicrophone();
my_mic.rate = 22;
my_mic.gain = 100;
my_mic.addEventListener(SampleDataEvent.SAMPLE_DATA, drawSampleData);
function drawSampleData(eventObject:SampleDataEvent):void
{
var myData:ByteArray = eventObject.data;
myGraphics.clear();
myGraphics.lineStyle(0, 0x000000);
myGraphics.moveTo(0, nCenter);
var nPitch:Number = nWidth / myData.length;
while (myData.bytesAvailable > 0)
{
var nX:Number = myData.position * nPitch;
var nY:Number = myData.readFloat() * nScale + nCenter;
myGraphics.lineTo(nX, nY);
}
}
谢谢。