Question

flash AS3.0 制作一个播放器，报错：1046：找不到类型，或者它不是编译时常数：jd_mc。

import flash.media.Sound;
import flash.media.SoundChannel;
import flash.events.MouseEvent;
import flash.net.URLRequest;
import flash.text.TextField;
import flash.events.Event;

var _sound:Sound =new Sound();
var _channel:SoundChannel =new SoundChannel();
var _playList:Array=new Array();
var _index:int=0;
var pos:Number =0;
var B:Boolean ;
var w:Number =jd_mc.jdt_mc.width;
var len:Number =_sound.length ;

_playList=["1.mp3","2.mp3","3.mp3"];
play_btn.addEventListener(MouseEvent.CLICK,play1);
function play1(event:MouseEvent ):void {
if (_index<_playList.length) {
_sound=new Sound ();
_sound.load (new URLRequest (_playList[_index]));
_channel=_sound.play(pos);
_channel.addEventListener (Event.SOUND_COMPLETE,oncomplete);
_index++;
_sound.addEventListener (Event.ID3,onID3);
function onID3(event:Event):void {
var id3Display:TextField =new TextField ();
addChild(id3Display);
id3Display.x=50;
id3Display.y=200;
id3Display.width=120;
id3Display.height=20;
id3Display.background=true;
id3Display.multiline=true;
id3Display.wordWrap=true;
id3Display.appendText(_sound.id3 .songName +"\n");
songname.text=_sound.id3.songName ;
}

var w:Number =jd_mc.jdt_mc.width;
var len:Number =_sound.length;
addEventListener(Event.ENTER_FRAME,jd);
function jd(event:Event):void {
len=_sound.length ;
pos=_channel.position ;
jd_mc.jdk_mc.x=pos/len*w;
}
function oncomplete(event:Event):void {
pos=0;
jd_mc.jdk_mc.x=0;
}
}
}

pause_btn.addEventListener (MouseEvent.CLICK,zt);
function zt(event:MouseEvent):void{
pos=_channel.position ;
_channel.stop();
_index--;
B=false;
}

stop_btn.addEventListener (MouseEvent.CLICK,tz);
function tz(event:MouseEvent):void{
pos=0;
_channel.stop();
_index--;
B=false;
addEventListener(Event.ENTER_FRAME ,jd);
function jd(event:Event ):void {
pos=0;
jd_mc.jdk_mc.x=0;
}
}

next_btn.addEventListener(MouseEvent.CLICK ,xis);
function xis(event:MouseEvent):void {
_index++;
}

back_btn.addEventListener(MouseEvent.CLICK ,qis);
function qis(event:MouseEvent):void {
_index--;
}

kj_btn.addEventListener (MouseEvent.CLICK,kj);
function kj(event:MouseEvent):void{

}
_channel.stop();
pos=pos+2000;
_channel=_sound.play(pos);

kt_btn.addEventListener (MouseEvent.CLICK,kt);
function kt(event:MouseEvent):void{

}
_channel.stop();
pos=pos-2000;
_channel=_sound.play(pos);

Answer 1

jd_mc应该是你自定义的，你即没有导入也没有实例化jd_mc，所以会报这样的错。

Answer 2

就是找不到一个名为jd_mc的实例