验证码插件 vercode.js

var vercode = new Object();
vercode.apiPath = "";
vercode.userId = "";
vercode.generateVerifyImage = function () {
    try {
        var url = vercode.apiPath;
        var userId = $(vercode.userId).val();
        $.ajax({
            url: url,
            type: 'post',
            data: { userId: userId },
            dataType: 'json',
            async: false,
            success: function (res) {
                if (res.code == 0) {
                    document.getElementById('verImage').src = "data:image/jepg;base64," + res.data;
                }
            },
            error: function () {
                console.log('Error occurred while opening the image file.');
            }
        });
    } catch (e) {

    } finally {
        document.getElementById('verset').style.display = 'block';
        document.getElementById('verset').style.top = ($('#vercode').offset().top + $('#vercode').height())+"px";
        document.getElementById('verset').style.left = ($('#vercode').offset().left)+"px";
        document.getElementById('code').innerText = '';
    }
}
vercode.appendVer = function (v) {
    var codeLength = 4;//   验证码长度
    if (document.getElementById('code').innerText.length == codeLength) {
        document.getElementById('verset').style.display = 'none';
        return;
    }
    document.getElementById('code').innerText += v.innerText;
};
vercode.Init = function (apiPath, userId) {
    let arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
    //arr.sort(() => Math.random() - 0.5);    //  如果希望键盘顺序显示，注释改行
    arr.splice(9, 0, 99);
    arr.push(99);

    var template = "";
    for (var i = 0; i < 12; i++) {
        if (i == 9 ) {
            template += '<li onclick="vercode.generateVerifyImage()">重置</li>';
        }
        else if (i == 11) {
            template += '<li onclick="document.getElementById(\'verset\').style.display = \'none\'">确认</li>';
        }
        else {
            template += '<li onclick="vercode.appendVer(this)">' + arr[i] + '</li>';
        }
    }
    $(".verset ul").html(template);
    $("#verImage").click(function () {
        vercode.generateVerifyImage();
    })
    $("#verImage").attr("title", "点击后刷新验证码");
    vercode.apiPath = apiPath;
    vercode.userId = userId;
};

.vercode {
    width: 330px;
    margin:10px 0px;
}

    .vercode .code {
        display: inline-block;
        width: 45%;
        margin-right: 5px;
        font-family: 'Arial Unicode MS';
        font: 20px/38px bold;
        line-height: 38px;
        height: 38px;
        text-align: center;
        float: left;
        border-radius: 5px;
        background-color: #f8f4f4;
        text-shadow: 2px 2px 2px #52c574;
    }

            .vercode .verimg {
                display: inline-block;
                width: 45%;
                margin-left: 5px;
                line-height: 38px;
                height: 38px;
                text-align: center;
                cursor: pointer;
            }

                .vercode .verimg img {
                    display: inline-block;
                    width: 100%;
                    height: 38px;
                    vertical-align: middle;
                    line-height: 38px;
                    text-align: center;
                    cursor: pointer;
                }

.verset {
    width: 330px;
    padding: 0px;
    text-align: left;
    height: 100px;
    display: none;
    margin: 10px;
    height: 120px;
    position: fixed;
    top: 0px;
    left: 0px;
    z-index: 9999;
}

        .verset ul {
            width: 76%;
            height: 126px;
            line-height: 28px;
            margin: 0px;
            clear: both;
            padding: 5px 0px;
            padding-left: 5px;
        }

            .verset ul li {
                float: left;
                list-style: none;
                width: 31%;
                background-color: #fff; /*  修改按钮背景色   */
                text-align: center;
                border: 1px solid #666;
                color: #666; /*  修改按钮字体色   */
                border-radius: 5px;
                cursor: pointer;
                margin:1px;
            }

<li>
                    <em></em>
                    <input type="text" id="userId" tabindex="1" placeholder="请输入用户名" class="longcode" />
                    <label id="imgUid" class="error_msg"></label>
                </li>
                <li>
                    <em class="code"></em>
                    <input type="password" id="pwd" placeholder="请输入密码" class="longcode on" tabindex="2" />
                    <label id="imgPwd" class="error_msg"></label>
                </li>


                <li>
                    <div class="vercode" id="vercode">
                        <div class="code" id="code"></div>
                        <div class="verimg">
                            <img src="" id="verImage" />
                        </div>
                    </div>

                </li>
...

 <div class="verset" id="verset">
            <ul></ul>
        </div>

<script>
        function syslogin() {
            $.post('/Login/Verify', { userId: $("#userId").val(), pwd: $("#pwd").val(), clientCode: $("#code").text() }, function (res) {
                if (res.code != 0) {
                    document.getElementById('lblMessage').innerText = res.msg;
                    document.getElementById('lblMessage').style.color = "red";
                }
                else {
                    document.getElementById('lblMessage').innerText = res.msg;
                    document.getElementById('lblMessage').style.color = "green";
                    //setTimeout(function () {
                    //    location.href = '/Basic/IcsonFrame_DBC_Table.aspx';
                    //},1000)
                }
            });
        }
       
    </script>

<script>
        $(function () {
            vercode.Init('/Login/GenerateVerifyImage', "#userId");
        })
    </script>

public class LoginController : Controller
    {
        private VryImgGen vryImgGen = new VryImgGen();
        // GET: Home
        public ActionResult Index()
        {
            return View();
        }
        [HttpPost]
        public ActionResult Verify(string userId,string pwd,string clientCode)
        {
            if(clientCode != Session[userId].TryString(""))
            {
                return Json(new { code = -1, msg = "验证码错误！" });
            }

            return Json(new { code = 0, msg = "验证成功" });
        }
        [HttpPost]
        public ActionResult GenerateVerifyImage(string userId)
        {
            //  校验用户账号是否有效，无效则返回空的图片
            var verifyCode = new Random().Next(1000, 9999).ToString();
            var bmp = vryImgGen.CreateImageCode(verifyCode);
            Session[userId] = verifyCode;

            MemoryStream ms = new MemoryStream();
            bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
            byte[] arr = new byte[ms.Length];
            ms.Position = 0;
            ms.Read(arr, 0, (int)ms.Length);
            ms.Close();
            return Json(new { code = 0, data = Convert.ToBase64String(arr),msg="获取验证码成功" });
        }
    }

using System;
using System.Collections.Generic;
using System.Web;
using System.Drawing;
...

/// <summary>
    /// 图片验证码
    /// </summary>
    public class VryImgGen
    {
        #region 生成校验码图片
        /// <summary>
        /// 生成校验码图片
        /// 校验码保存在Session["ImgGen"]中
        /// </summary>
        /// <returns>Bitmap</returns>
        public Bitmap CreateImageCode()
        {
            string code = CreateVerifyCode(Length);
            HttpContext.Current.Session["ImgGen"] = code.ToUpper();
            int fSize = FontSize;
            int fWidth = fSize + Padding;
            int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2;
            int imageHeight = fSize * 2 + Padding;

            System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);
            Graphics g = Graphics.FromImage(image);
            g.Clear(BackgroundColor);
            Random rand = new Random();

            //给背景添加随机生成的燥点
            if (this.Chaos)
            {
                Pen pen = new Pen(ChaosColor, 0);
                int c = Length * 100;

                for (int i = 0; i < c; i++)
                {
                    int x = rand.Next(image.Width);
                    int y = rand.Next(image.Height);

                    g.DrawRectangle(pen, x, y, 1, 1);
                }
            }

            int left = 0, top = 0, top1 = 1, top2 = 1;

            int n1 = (imageHeight - FontSize - Padding * 2);
            int n2 = n1 / 4;
            top1 = n2;
            top2 = n2 * 2;

            Font f;
            Brush b;
            int cindex, findex;

            //随机字体和颜色的验证码字符
            for (int i = 0; i < code.Length; i++)
            {
                cindex = rand.Next(Colors.Length - 1);
                findex = rand.Next(Fonts.Length - 1);

                f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);
                b = new System.Drawing.SolidBrush(Colors[cindex]);

                if (i % 2 == 1)
                {
                    top = top2;
                }
                else
                {
                    top = top1;
                }

                left = i * fWidth;

                g.DrawString(code.Substring(i, 1), f, b, left, top);
            }

            //画一个边框 边框颜色为Color.Gainsboro
            g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);
            g.Dispose();

            //产生波形
            image = TwistImage(image, false, 0, 0);

            return image;
        }

        public Bitmap CreateImageCode(string code)
        {
            int fSize = FontSize;
            int fWidth = fSize + Padding;

            int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2;
            int imageHeight = fSize * 2 + Padding;

            System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);

            Graphics g = Graphics.FromImage(image);

            g.Clear(BackgroundColor);

            Random rand = new Random();

            //给背景添加随机生成的燥点  
            if (this.Chaos)
            {

                Pen pen = new Pen(ChaosColor, 0);
                int c = Length * 10;

                for (int i = 0; i < c; i++)
                {
                    int x = rand.Next(image.Width);
                    int y = rand.Next(image.Height);

                    g.DrawRectangle(pen, x, y, 1, 1);
                }
            }

            int left = 0, top = 0, top1 = 1, top2 = 1;

            int n1 = (imageHeight - FontSize - Padding * 2);
            int n2 = n1 / 4;
            top1 = n2;
            top2 = n2 * 2;

            Font f;
            Brush b;

            int cindex, findex;

            //随机字体和颜色的验证码字符  
            for (int i = 0; i < code.Length; i++)
            {
                cindex = rand.Next(Colors.Length - 1);
                findex = rand.Next(Fonts.Length - 1);

                f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);
                b = new System.Drawing.SolidBrush(Colors[cindex]);

                if (i % 2 == 1)
                {
                    top = top2;
                }
                else
                {
                    top = top1;
                }

                left = i * fWidth;

                g.DrawString(code.Substring(i, 1), f, b, left, top);
            }

            //画一个边框 边框颜色为Color.Gainsboro  
            g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);
            g.Dispose();

            //产生波形（Add By 51aspx.com）  
            image = TwistImage(image, true, 3, 2);

            return image;
        }

        #endregion

        #region 属性

        #region 验证码长度
        int length = 4;
        public int Length
        {
            get { return length; }
            set { length = value; }
        }
        #endregion

        #region 验证码字体大小(为了显示扭曲效果，默认40像素，可以自行修改)
        int fontSize = 26;
        public int FontSize
        {
            get { return fontSize; }
            set { fontSize = value; }
        }
        #endregion

        #region 边框补(默认1像素)
        int padding = 2;
        public int Padding
        {
            get { return padding; }
            set { padding = value; }
        }
        #endregion

        #region 是否输出燥点(默认不输出)
        bool chaos = true;
        public bool Chaos
        {
            get { return chaos; }
            set { chaos = value; }
        }
        #endregion

        #region 输出燥点的颜色(默认灰色)
        Color chaosColor = Color.LightGray;
        public Color ChaosColor
        {
            get { return chaosColor; }
            set { chaosColor = value; }
        }
        #endregion

        #region 自定义背景色(默认白色)
        Color backgroundColor = Color.White;
        public Color BackgroundColor
        {
            get { return backgroundColor; }
            set { backgroundColor = value; }
        }
        #endregion

        #region 自定义随机颜色数组
        Color[] colors = { Color.Black, Color.Black, Color.Black, Color.Black, Color.Black, Color.Black, Color.Black, Color.Black };
        public Color[] Colors
        {
            get { return colors; }
            set { colors = value; }
        }
        #endregion

        #region 自定义字体数组
        string[] fonts = { "华文中宋", "华文中宋" };
        public string[] Fonts
        {
            get { return fonts; }
            set { fonts = value; }
        }
        #endregion

        #region 自定义随机码字符串序列(使用逗号分隔)
        string codeSerial = "2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,j,k,m,n,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,U,V,W,X,Y,Z";
        public string CodeSerial
        {
            get { return codeSerial; }
            set { codeSerial = value; }
        }
        #endregion
        #endregion

        #region 产生波形滤镜效果

        private const double PI = 3.1415926535897932384626433832795;
        private const double PI2 = 6.283185307179586476925286766559;

        /// <summary>
        /// 正弦曲线Wave扭曲图片（Edit By 51aspx.com）
        /// </summary>
        /// <param name="srcBmp">图片路径</param>
        /// <param name="bXDir">如果扭曲则选择为True</param>
        /// <param name="nMultValue">波形的幅度倍数，越大扭曲的程度越高，一般为3</param>
        /// <param name="dPhase">波形的起始相位，取值区间[0-2*PI)</param>
        /// <returns></returns>
        public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
        {
            System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);

            // 将位图背景填充为白色
            System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);
            graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height);
            graph.Dispose();

            double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;

            for (int i = 0; i < destBmp.Width; i++)
            {
                for (int j = 0; j < destBmp.Height; j++)
                {
                    double dx = 0;
                    dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;
                    dx += dPhase;
                    double dy = Math.Sin(dx);

                    // 取得当前点的颜色
                    int nOldX = 0, nOldY = 0;
                    nOldX = bXDir ? i + (int)(dy * dMultValue) : i;
                    nOldY = bXDir ? j : j + (int)(dy * dMultValue);

                    System.Drawing.Color color = srcBmp.GetPixel(i, j);
                    if (nOldX >= 0 && nOldX < destBmp.Width
                     && nOldY >= 0 && nOldY < destBmp.Height)
                    {
                        destBmp.SetPixel(nOldX, nOldY, color);
                    }
                }
            }

            return destBmp;
        }



        #endregion

        #region 生成随机字符码
        public string CreateVerifyCode(int codeLen)
        {
            if (codeLen == 0)
            {
                codeLen = Length;
            }

            string[] arr = CodeSerial.Split(',');

            string code = "";

            int randValue = -1;

            Random rand = new Random(unchecked((int)DateTime.Now.Ticks));

            for (int i = 0; i < codeLen; i++)
            {
                randValue = rand.Next(0, arr.Length - 1);

                code += arr[randValue];
            }

            return code;
        }
        public string CreateVerifyCode()
        {
            return CreateVerifyCode(0);
        }
        #endregion
    }