验 正

哈哈，是不是觉得最后那个验证码很变态=。=

来看下Demo部分的代码：

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01.import org.nwhy.utils.Captcha;

02.var cpTypes:Array=["number","character","math","bt"];

03.var aryCps:Array=[];

04.var cpNum:uint=4;

05.init();

06.function init() {

07.    for (var i:uint=0; i<cpnum ; i++) {

08.        var cp:Captcha=new Captcha(cpTypes[i]);

09.        cp.x=130;

10.        cp.y=40*i+15;

11.        cp.addEventListener("change",cpChange);

12.        addChild(cp);

13.        aryCps.push(cp);

14.        this["txt_ipt"+i].addEventListener("change",iptChange);

15.    }

16.}

17.function cpChange(_e:Event) {

18.    var obj:Captcha=_e.currentTarget as Captcha;

19.    trace(obj.captcha);

20.}

21.function iptChange(_e:Event) {

22.    var obj:TextField=_e.currentTarget as TextField;

23.    var num:uint=_e.currentTarget.name.substr(7);

24.    if (obj.text==aryCps[num].captcha) {

25.        this["txt_msg"+num].text="验证通过";

26.    } else {

27.        this["txt_msg"+num].text="验证失败";

28.    }

29.}

Captcha类代码如下：

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001./*

002.VERSION: 1.0 DATE:2009/11/20

003.ACTIONSCRIPT VERSION: 3.0

004.AUTHOR: DFdou, k5love@foxmail.com

005.Copyright 2009, nwhy.org. All rights reserved.

006.  

007.DESCRIPTION:

008.    Captcha is a simple class to generate Caphtcha Sprite.

009.  

010.PARAMETERS:

011.    1) type:String="number": Captcha type you want to create, there are four types ["number","character","math","bt"];

012.    2) length:uint=5: Captcha length,work with type ["number","character"];

013.    3) noiseFlag:Boolean=true: if true Captcha will draw noise;

014.    4) size:uint=18: textfiled's fontsize;

015.  

016.NOTES:

017.    - when the Captcha was changed,will dispatch an event named "change",then you can addEventListener to capture it.

018.  

019.EXAMPLE:

020.    var cp:Captcha = new Captcha(); //default Captcha as number type width noise,length=5,size=18;

021.    var cp:Captcha = new Captcha("character", 4); //character type Captcha,length=4;

022.    var cp:Captcha = new Captcha("bt", 0, false, 20); //bt type Captcha width no noise,and fontsize=20;

023. */

024.package org.nwhy.utils{

025.    import flash.display.DisplayObjectContainer;

026.    import flash.display.Sprite;

027.    import flash.events.MouseEvent;

028.    import flash.events.Event;

029.    import flash.text.TextField;

030.    import flash.text.TextFormat;

031.    import flash.text.TextFieldAutoSize;

032.    public class Captcha extends Sprite {

033.        private var __type:String;

034.        private var __length:uint;

035.        private var __size:uint;

036.        private var __tft:TextFormat = new TextFormat();

037.        private var __noiseFlag:Boolean;

038.        private var __aryType:Array=["number","character","math","bt"];

039.        private var __aryCharacters:Array=["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"];

040.        private var __randCode:String="";

041.  

042.        private const CHANGE:String="change";

043.        private var sp_cont:Sprite=new Sprite();

044.        private var sp_noise:Sprite=new Sprite();

045.  

046.        public function Captcha(type:String="number",length:uint=5,noiseFlag:Boolean=true,size:uint=18):void {

047.            __type = type;

048.            __length = length;

049.            __noiseFlag = noiseFlag;

050.            __size = size;

051.  

052.            __tft.font = "Arial";

053.            __tft.size=__size;

054.            __tft.bold = true;

055.            sp_cont.x=__size/2;

056.            addChild(sp_cont);

057.            if (__aryType.indexOf(__type)==-1) {

058.                __type=__aryType[3];

059.            }

060.            reRandCaptcha(null);

061.            addEventListener(MouseEvent.MOUSE_DOWN,reRandCaptcha);

062.        }

063.        private function reRandCaptcha(_e:MouseEvent){

064.            removeAllChild(sp_cont);

065.            randCaptcha(__type);

066.            drawNoise();

067.            drawBorder();

068.            dispatchEvent(new Event(CHANGE));

069.        }

070.        private function randCaptcha(type:String):void {

071.            __randCode="";

072.            switch (type) {

073.                case __aryType[0] :

074.                    randCaptchaWithNumber();

075.                    break;

076.                case __aryType[1] :

077.                    randCaptchaWithCharacter();

078.                    break;

079.                case __aryType[2] :

080.                    randCaptchaWithMath();

081.                    break;

082.                case __aryType[3] :

083.                    randCaptchaWithBt();

084.                    break;

085.                default:

086.                    randCaptchaWithNumber();

087.            }

088.        }

089.        private function randCaptchaWithNumber():void {

090.            for (var i:uint=0; i<__length; i++) {

091.                var tf:TextField=new TextField();

092.                tf.text = String(randInt(0,9));

093.                __randCode+=tf.text;

094.                tf.selectable = false;

095.                tf.x = int(__tft.size) * i;

096.                tf.textColor = randInt(0,0x888888);

097.                tf.autoSize = TextFieldAutoSize.LEFT;

098.                tf.setTextFormat(__tft);

099.                sp_cont.addChild(tf);

100.            }

101.        }

102.        private function randCaptchaWithCharacter():void {

103.            for (var i:uint=0; i<__length; i++) {

104.                var tf:TextField=new TextField();

105.                tf.text = __aryCharacters[randInt(0,51)];

106.                __randCode+=tf.text;

107.                tf.selectable = false;

108.                tf.x = int(__tft.size) * i;

109.                tf.textColor = randInt(0,0x888888);

110.                tf.autoSize = TextFieldAutoSize.LEFT;

111.                tf.setTextFormat(__tft);

112.                sp_cont.addChild(tf);

113.            }

114.            __randCode = __randCode.toLowerCase();

115.        }

116.        private function randCaptchaWithMath():void {

117.            var rand1:uint=randInt(0,5);

118.            var rand2:uint=randInt(0,10);

119.            var rand3:uint=randInt(0,5);

120.            var rand4:uint=randInt(0,10);

121.            var tf:TextField=new TextField();

122.            tf.text = "(" + rand1 + "+" + rand2 + ")" + "*(" + rand3 + "+" + rand4 + ")";

123.            tf.selectable = false;

124.            tf.textColor = randInt(0,0x888888);

125.            tf.autoSize = TextFieldAutoSize.LEFT;

126.            tf.setTextFormat(__tft);

127.            sp_cont.addChild(tf);

128.            __randCode = String((rand1+rand2)*(rand3+rand4));

129.        }

130.        private function randCaptchaWithBt():void {

131.            var rand1:Number = Number(randNumber(0,Math.PI).toFixed(2));

132.            var rand2:Number = Number(randNumber(0,Math.PI).toFixed(2));

133.            var tf:TextField = new TextField();

134.            tf.text = "Math.pow(" + rand1 + ",Math.log(" + rand2 + "))";

135.            tf.selectable = false;

136.            tf.textColor = randInt(0,0x888888);

137.            tf.autoSize = TextFieldAutoSize.LEFT;

138.            tf.setTextFormat(__tft);

139.            sp_cont.addChild(tf);

140.            __randCode = Math.pow(rand1,Math.log(rand2)).toFixed(3);

141.        }

142.        private function drawNoise():void{

143.            if(__noiseFlag){

144.                sp_noise.graphics.clear();

145.                for(var i=0;i<25;i++){

146.                    var ptx = randInt(1,width);

147.                    var pty = randInt(1,height);

148.                    var ex=ptx+randInt(-width,width);

149.                    var ey=pty+randInt(-height,height);

150.                    ex=(ex<=1)?1:((ex>=(width))?(width):ex);

151.                    ey=(ey< =1)?1:((ey>=height-1)?height-1:ey);

152.                    sp_noise.graphics.lineStyle(1,randInt(0,0xFFFFFF),0.25);

153.                    sp_noise.graphics.moveTo(ptx,pty);

154.                    sp_noise.graphics.lineTo(ex,ey);

155.                }

156.                sp_noise.width= sp_cont.width + __size;

157.                sp_noise.height= sp_cont.height;

158.                addChild(sp_noise);

159.            }

160.            return;

161.        }

162.        private function drawBorder():void{

163.            graphics.clear();

164.            graphics.lineStyle(1,0x006699);

165.            graphics.drawRect(0,0,sp_cont.width+__size,height);

166.            graphics.beginFill(0);

167.        }

168.        private function removeAllChild(container:DisplayObjectContainer){

169.            while(container.numChildren>0){

170.                container.removeChildAt(0);

171.            }

172.        }

173.        private function randInt(min:int,max:int):int {

174.            return Math.random() * (max - min) + min;

175.        }

176.        private function randNumber(min:Number,max:Number):Number {

177.            return Math.random() * (max - min) + min;

178.        }

179.        public function get captcha():String{

180.            return __randCode;

181.        }

182.    }

183.}

文档说明的已经很清楚了，这里就不再介绍咯。