Question

as3.0 无法访问空对象引用的属性或方法，急！

是一个实现控制声音的项目，源代码如下：
var snd:Sound;
var channel:SoundChannel;
var trans:SoundTransform;
var currSong:String;
var currVol:Number = 0.5;
var currPan:Number = 0;
var songList:Array = new Array("Bruno Mars - Just The Way You Are.mp3","Carol+of+The+Bells.mp3","Dia Frampton - Walk Away.mp3","Fooling+Mode.mp3","冰菊物语%28古筝版%29-《舌尖上的中国》原声.mp3");
for (var i=0; i<songList.length; i++)
{
var str:String = songList[i] as String;
str = str.replace(".mp3","");
var clip = this["song" + (i + 1)].title;
clip.text = str;
}
panSlider.visible = false;
volSlider.visible = false;
song1.addEventListener(MouseEvent.CLICK,chooseSong);
song2.addEventListener(MouseEvent.CLICK,chooseSong);
song3.addEventListener(MouseEvent.CLICK,chooseSong);
song4.addEventListener(MouseEvent.CLICK,chooseSong);
song5.addEventListener(MouseEvent.CLICK,chooseSong);
function chooseSong(e:MouseEvent):void
{
switch (e.currentTarget.name)
{
case "song1" :
currSong = "../mp3/" + songList[0] as String;
break;
case "song2" :
currSong = "../mp3/" + songList[1] as String;
break;
case "song3" :
currSong = "../mp3/" + songList[2] as String;
break;
case "song4" :
currSong = "../mp3/" + songList[3] as String;
break;
case "song5" :
currSong = "../mp3/" + songList[4] as String;
break;
}
if (snd!=null)
{
channel.stop();
snd=new Sound();
}
snd.load(new URLRequest(currSong));
channel = new SoundChannel() ;
trans = new SoundTransform(currVol,currPan);
channel = snd.play();
channel.soundTransform = trans;
}

Answer 1

var clip = this["song" + (i + 1)].title;
clip.text = str;

你这个自己声明的clip是什么来的 感觉就是场景上的一个文本框 但你又var 干啥？

追问

对于新出现的变量，当然需要var来声明吧，把var去掉只会增加新的错误，即clip未定义。这里是将实例名为title的文本框赋给它，就算是把这两句注释掉，改成this["song" + (i + 1)].title.text = str;同样也会报同样的错的！

追答

你最好还是上传你的源文件吧(外部音乐不需要) ，我也是打开flash重建你的元件来运行的，你不上传，也不好分析

追问

请问如何上传源文件呢？以前没上传过~

追答

回答框的上面一行 右边的 附件
你把源文件用winRar压缩成一个rar文件上传吧

追问

还处于一级水平，要到四级还是五级才可以上传吧！

追答

http://pan.baidu.com
上传一下 然后发地址吧