设定队列长度为3，超出的长度，直接调用其消失方法即可。唯一不同的是，注意添加参数overwrite，并设置其值为1。这里有关于overwrite值的详情介绍：
code：
1: package
2: { 3: import flash.display.Bitmap;
4: import flash.display.BitmapData;
5: import flash.display.Sprite;
6: import flash.filters.GlowFilter;
7: import flash.text.TextField;
8: import flash.text.TextFormat;
9: import flash.text.TextFormatAlign;
10: import gs.TweenLite;
11: /**
12: * ...
13: * @author Meteoric
14: */
15: public class TextMessage extends Sprite
16: { 17: private var textFormat:TextFormat = new TextFormat("Arial", 14, 0x00FF00, true); 18: private var glowFilter:GlowFilter = new GlowFilter(0x000000, 0.7, 2, 2, 12, 5);
19:
20: private var txtArr:Array = [];
21: private var tweenArr:Array = [];
22:
23: private var defaultY:Number = 80;
24:
25: public function TextMessage()
26: { 27: this.mouseEnabled = false;
28: this.mouseChildren = false;
29: }
30:
31: public function addText(txt:String, isHTML:Boolean = false):void
32: { 33: textFormat.letterSpacing = 2;
34:
35: var sprite:Sprite = new Sprite();
36: addChild(sprite);
37:
38: var textField:TextField = new TextField;
39: textField.autoSize = TextFormatAlign.LEFT;
40: textField.htmlText = txt;
41:
42: if (!isHTML)
43: { 44: textField.setTextFormat(textFormat);
45: }
46:
47: var bmp:Bitmap = new Bitmap();
48: var bmpData:BitmapData = new BitmapData(textField.width, textField.height, true, 0x00000000);
49: bmpData.draw(textField);
50:
51: bmp.bitmapData = bmpData;
52: bmp.x = -bmp.width / 2;
53: bmp.filters = [glowFilter];
54: bmp.smoothing = true;
55:
56: sprite.addChild(bmp);
57:
58: sprite.width = bmp.width * 1.3;
59: sprite.height = bmp.height * 1.3;
60: sprite.x = 200;
61: sprite.y = 120;
62:
63: txtArr.push(sprite);
64:
65: var aryLen:int = txtArr.length;
66:
67: for (var i:int = 0, len:int = aryLen - 3; i < len; i++)
68: { 69: var tempSprite:Sprite = txtArr[i] as Sprite;
70:
71: TweenLite.to(tempSprite, 0.2, {width:sprite.width, height:sprite.height, alpha:0, onComplete:onCompleteFunc, onCompleteParams:[tempSprite], overwrite:1}); 72: }
73:
74: TweenLite.to(sprite, 0.2, {width:bmp.width, height:bmp.height, overwrite:1}); 75: TweenLite.to(sprite, 0.4, {width:sprite.width, height:sprite.height, alpha:0, delay:3, onComplete:onCompleteFunc, onCompleteParams:[sprite], overwrite:0}); 76:
77: len = aryLen > 3 ? aryLen - 3 : 0;
78: for (i = aryLen - 1; i >= len; i--)
79: { 80: var _y:int = -27 * (aryLen - i - 1) + 100;
81: TweenLite.to(txtArr[i], 0.2+(aryLen-i-1)*0.2, {y:_y,overwrite:0}); 82: }
83: }
84:
85: private function onCompleteFunc(param_1:Sprite):void
86: { 87:
88: var len:int = txtArr.length;
89:
90: for (var i:int = 0; i < len; i++)
91: { 92: if (txtArr[i] == param_1)
93: { 94: var bmp:Bitmap = param_1.getChildAt(0) as Bitmap;
95: bmp.bitmapData.dispose();
96: param_1.removeChild(bmp);
97: bmp = null;
98: txtArr.splice(i,1);
99: this.removeChild(param_1);
100: param_1 = null;
101: break;
102: }
103: }
104: }
105:
106: }
107:
108: }