oa_mvc_easyui_项目搭建及登录页面验证码(1)

1.空项目的搭建，三层的搭建(各层之中的引用)

webapp:bll,model,common

bll:dal,model

dal:model

2.SQL表

ItcastDb:T_UserInfo,T_News,T_NewComments

T_UserInfo:

USE [ItcastDb]
GO

/****** Object:  Table [dbo].[T_UserInfo]    Script Date: 05/24/2017 09:13:43 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TABLE [dbo].[T_UserInfo](
    [id] [int] IDENTITY(1,1) NOT NULL,
    [UserName] [nvarchar](50) NULL,
    [UserPwd] [nvarchar](50) NULL,
    [UserMail] [nvarchar](50) NULL,
    [RegTime] [datetime] NULL,
 CONSTRAINT [PK_T_UserInfo] PRIMARY KEY CLUSTERED
(
    [id] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

ALTER TABLE [dbo].[T_UserInfo] ADD  CONSTRAINT [DF_T_UserInfo_RegTime]  DEFAULT (getdate()) FOR [RegTime]
GO

T_News:

USE [ItcastDb]
GO

/****** Object:  Table [dbo].[T_News]    Script Date: 05/24/2017 09:13:38 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TABLE [dbo].[T_News](
    [id] [int] IDENTITY(1,1) NOT NULL,
    [Title] [nvarchar](50) NULL,
    [Msg] [nvarchar](2000) NULL,
    [SubDateTime] [datetime] NULL,
    [Author] [nvarchar](50) NULL,
    [ImagePath] [nvarchar](50) NULL,
 CONSTRAINT [PK_T_News] PRIMARY KEY CLUSTERED
(
    [id] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

T_NewComments:

USE [ItcastDb]
GO

/****** Object:  Table [dbo].[T_NewComments]    Script Date: 05/24/2017 09:13:28 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TABLE [dbo].[T_NewComments](
    [id] [int] IDENTITY(1,1) NOT NULL,
    [NewId] [int] NULL,
    [Msg] [nvarchar](50) NULL,
    [CreateDateTime] [datetime] NULL,
 CONSTRAINT [PK_T_NewComments] PRIMARY KEY CLUSTERED
(
    [id] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

3.Model实体类的编写

T_NewComments：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Itcast.CMS.Model
{
    public class T_NewComments
    {
        public int Id { get; set; }
        public int NewId { get; set; }
        public string Msg { get; set; }
        public DateTime CreateDateTime { get; set; }
    }
}

T_UserInfo：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Itcast.CMS.Model
{
    public class T_UserInfo
    {
        public int Id { get; set; }
        public string UserName { get; set; }
        public string UserPwd { get; set; }
        public string UserMail { get; set; }
        public DateTime RegTime { get; set; }
    }
}

T_News：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Itcast.CMS.Model
{
    public class T_News
    {
        public int Id { get; set; }
        public string Title { get; set; }
        public string Msg { get; set; }
        public DateTime SubDateTime { get; set; }
        public string Author { get; set; }
        public string ImagePath { get; set; }
    }
}

4.DAl层编写SqlHelp类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
using System.Data.SqlClient;

namespace Itcast.CMS.DAL
{
    public class SqlHelper
    {
        /// <summary>
        /// 自定义数据库连接字符串
        /// </summary>
        public static string ConnString = @"Data Source=.;Initial Catalog=zhigongWebDB; User ID=sa;Pwd=123456";
        /// <summary>
        /// 应用程序下获取连接字符串
        /// </summary>
        //public static string ConnString
        //{
        //    get {

        //        return System.Configuration.ConfigurationManager.ConnectionStrings["connstring"].ToString();
        //    }
        //}

        /// <summary>
        /// 执行一个Sql语句返回受影响的行数
        /// </summary>
        /// <param name="sql">insert,update,delete或相关的存储过程</param>
        /// <param name="type">命令类型：SQL语句还是存储过程</param>
        /// <param name="pars">SQL语句所需要的参数</param>
        public static int ExcuteSQLReturnInt(string sql, CommandType type, params SqlParameter[] pars)
        {
            //定义连接对象
            SqlConnection conn = new SqlConnection(ConnString);
            //判断连接对象的状态，并且打开
            if (conn.State == ConnectionState.Closed || conn.State == ConnectionState.Broken)
            {
                conn.Open();
            }
            try
            {
                //实例化命令对象
                SqlCommand cmd = new SqlCommand(sql, conn);
                //判断CommandType类型是否是SQL语句还是存储过程
                cmd.CommandType = type;
                if (pars != null && pars.Length > )
                {
                    foreach (SqlParameter p in pars)
                    {
                        cmd.Parameters.Add(p);
                    }
                }
                //调用方法执行SQL语句或存储过程
                int count = cmd.ExecuteNonQuery();
                return count;
            }
            catch (Exception ex)
            {
                return ;
            }
            finally
            {
                //记得要关闭连接
                conn.Close();
            }
        }

        /// <summary>
        /// 执行一个Sql语句或存储过程，返回一条记录，sqldataReader
        /// </summary>
        /// <param name="sql">select语句，或相关的存储过程</param>
        /// <param name="type">指定命令类型，sql语句还是存储过程，默认的是sql语句</param>
        /// <param name="pars">参数的集合</param>
        /// <returns></returns>
        public static SqlDataReader ExcuteSqlReturnReader(string sql, CommandType type, SqlParameter[] pars)
        {
            SqlConnection conn = new SqlConnection(ConnString);
            if (conn.State == ConnectionState.Closed || conn.State == ConnectionState.Broken)
            {
                conn.Open();
            }
            SqlCommand cmd = new SqlCommand(sql, conn);
            if (pars != null && pars.Length > )
            {
                foreach (SqlParameter p in pars)
                {
                    cmd.Parameters.Add(p);
                }
            }
            cmd.CommandType = type;
            //当reader.close(),也就是关闭了datareader时，CommandBehavior.CloseConnection 也会关闭连接！
            SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            return reader;
        }

        /// <summary>
        /// 执行一个sql语句或存储过程,不带参数的!返回一天记录 sqldataReader
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="type"></param>
        /// <returns></returns>
        public static SqlDataReader ExcuteSqlReturnReader(string sql, CommandType type)
        {
            SqlConnection conn = new SqlConnection(ConnString);
            if (conn.State == ConnectionState.Closed || conn.State == ConnectionState.Broken)
            {
                conn.Open();
            }
            SqlCommand cmd = new SqlCommand(sql, conn);
            cmd.CommandType = type;
            //当reader.close(),也就是关闭了datareader时，CommandBehavior.CloseConnection 也会关闭连接！
            SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            return reader;
        }

        /// <summary>
        ///  执行一个Sql语句或存储过程，返回一个数据集，dataset
        /// </summary>
        /// <param name="sql">select语句或相关的存储过程</param>
        /// <param name="type">命令类型</param>
        /// <param name="pars">命令类型</param>
        /// <returns>DataSet</returns>
        public static DataSet SelectSqlReturnDataset(string sql, CommandType type, SqlParameter[] pars)
        {
            SqlConnection conn = new SqlConnection(ConnString);
            //数据集识别器对象SqlDataAdapter 会自动打开数据库链接！
            SqlDataAdapter sda = new SqlDataAdapter(sql, conn);
            if (pars != null && pars.Length > )
            {
                foreach (SqlParameter p in pars)
                {
                    sda.SelectCommand.Parameters.Add(p);
                }
            }
            sda.SelectCommand.CommandType = type;
            DataSet ds = new DataSet();
            sda.Fill(ds);
            return ds;
        }

        /// <summary>
        /// 执行一个sql语句返回一个数据表对象
        /// </summary>
        /// <param name="sql">select</param>
        /// <param name="type">命令类型</param>
        /// <param name="pars">参数集合</param>
        /// <returns>DataTable</returns>
        public static DataTable SelectSqlReturnDataTable(string sql, CommandType type, SqlParameter[] pars)
        {
            SqlConnection conn = new SqlConnection(ConnString);
            SqlDataAdapter sda = new SqlDataAdapter(sql, conn);
            if (pars != null && pars.Length > )
            {
                foreach (SqlParameter p in pars)
                {
                    sda.SelectCommand.Parameters.Add(p);
                }
            }
            sda.SelectCommand.CommandType = type;
            DataTable dt = new DataTable();
            sda.Fill(dt);
            return dt;
        }

        //*******************************************************************
        //SelectSqlReturnDataTable方法的重载，不传参数的情况下
        /// <summary>
        /// 执行一个sql语句返回一个数据表对象,不传参数
        /// </summary>
        /// <param name="sql">select</param>
        /// <param name="type">命令类型</param>
        /// <returns></returns>
        public static DataTable SelectSqlReturnDataTable(string sql, CommandType type)
        {
            SqlConnection conn = new SqlConnection(ConnString);
            SqlDataAdapter sda = new SqlDataAdapter(sql, conn);
            sda.SelectCommand.CommandType = type;
            DataTable dt = new DataTable();
            sda.Fill(dt);
            return dt;
        }

        /// <summary>
        /// 执行一个sql语句或相关的存储过程，返回一个值
        /// </summary>
        /// <param name="sql">select count(*) from tablename where ....</param>
        /// <param name="type">命令类型</param>
        /// <param name="pars">所需的参数</param>
        /// <returns>object</returns>
        public static object selectSqlReturnObject(string sql, CommandType type, SqlParameter[] pars)
        {
            SqlConnection conn = new SqlConnection(ConnString);
            if (conn.State == ConnectionState.Closed || conn.State == ConnectionState.Broken)
            {
                conn.Open();
            }
            try
            {
                SqlCommand cmd = new SqlCommand(sql, conn);
                cmd.CommandType = type;
                if (pars != null && pars.Length > )
                {
                    foreach (SqlParameter p in pars)
                    {
                        cmd.Parameters.Add(p);
                    }
                }
                object obj = cmd.ExecuteScalar();
                return obj;
            }
            catch (Exception ex)
            {
                return null;
            }
            finally
            {
                conn.Close();
            }
        }

    }
}

5.新建登录控制器(LoginControllers)，并添加index视图

**更改路由：Global.asax--RouteConfig.RegisterRoutes(RouteTable.Routes)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;

namespace Itcast.CMS.WebApp
{
    public class RouteConfig
    {
        public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "Login", action = "Index", id = UrlParameter.Optional }
            );
        }
    }
}

6.新建登录页面，及验证码

Common通用层中新建ValidateCode类，用于生产验证码（引用命名空间:system.Drawing,system.Web）

ValidateCode：

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;

namespace Itcast.CMS.Common
{
   public class ValidateCode
    {
        public ValidateCode()
        {
        }
        /// <summary>
        /// 验证码的最大长度
        /// </summary>
        public int MaxLength
        {
            get { return ; }
        }
        /// <summary>
        /// 验证码的最小长度
        /// </summary>
        public int MinLength
        {
            get { return ; }
        }
        /// <summary>
        /// 生成验证码
        /// </summary>
        /// <param name="length">指定验证码的长度</param>
        /// <returns></returns>
        public string CreateValidateCode(int length)
        {
            int[] randMembers = new int[length];
            int[] validateNums = new int[length];
            string validateNumberStr = "";
            //生成起始序列值
            int seekSeek = unchecked((int)DateTime.Now.Ticks);
            Random seekRand = new Random(seekSeek);
            int beginSeek = (int)seekRand.Next(, Int32.MaxValue - length * );
            int[] seeks = new int[length];
            for (int i = ; i < length; i++)
            {
                beginSeek += ;
                seeks[i] = beginSeek;
            }
            //生成随机数字
            for (int i = ; i < length; i++)
            {
                Random rand = new Random(seeks[i]);
                int pownum =  * (int)Math.Pow(, length);
                randMembers[i] = rand.Next(pownum, Int32.MaxValue);
            }
            //抽取随机数字
            for (int i = ; i < length; i++)
            {
                string numStr = randMembers[i].ToString();
                int numLength = numStr.Length;
                Random rand = new Random();
                int numPosition = rand.Next(, numLength - );
                validateNums[i] = Int32.Parse(numStr.Substring(numPosition, ));
            }
            //生成验证码
            for (int i = ; i < length; i++)
            {
                validateNumberStr += validateNums[i].ToString();
            }
            return validateNumberStr;
        }
        /// <summary>
        /// 创建验证码的图片
        /// </summary>
        /// <param name="context">要输出到的page对象</param>
        /// <param name="validateNum">验证码</param>
        public void CreateValidateGraphic(string validateCode, HttpContext context)
        {
            Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 12.0), );
            Graphics g = Graphics.FromImage(image);
            try
            {
                //生成随机生成器
                Random random = new Random();
                //清空图片背景色
                g.Clear(Color.White);
                //画图片的干扰线
                for (int i = ; i < ; i++)
                {
                    int x1 = random.Next(image.Width);
                    int x2 = random.Next(image.Width);
                    int y1 = random.Next(image.Height);
                    int y2 = random.Next(image.Height);
                    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
                }
                Font font = new Font("Arial", , (FontStyle.Bold | FontStyle.Italic));
                LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(, , image.Width, image.Height),
                 Color.Blue, Color.DarkRed, 1.2f, true);
                g.DrawString(validateCode, font, brush, , );
                //画图片的前景干扰点
                for (int i = ; i < ; i++)
                {
                    int x = random.Next(image.Width);
                    int y = random.Next(image.Height);
                    image.SetPixel(x, y, Color.FromArgb(random.Next()));
                }
                //画图片的边框线
                g.DrawRectangle(new Pen(Color.Silver), , , image.Width - , image.Height - );
                //保存图片数据
                MemoryStream stream = new MemoryStream();
                image.Save(stream, ImageFormat.Jpeg);
                //输出图片流
                context.Response.Clear();
                context.Response.ContentType = "image/jpeg";
                context.Response.BinaryWrite(stream.ToArray());
            }
            finally
            {
                g.Dispose();
                image.Dispose();
            }
        }
        /// <summary>
        /// 得到验证码图片的长度
        /// </summary>
        /// <param name="validateNumLength">验证码的长度</param>
        /// <returns></returns>
        public static int GetImageWidth(int validateNumLength)
        {
            return (int)(validateNumLength * 12.0);
        }
        /// <summary>
        /// 得到验证码的高度
        /// </summary>
        /// <returns></returns>
        public static double GetImageHeight()
        {
            return 22.5;
        }

        //C# MVC 升级版
        /// <summary>
        /// 创建验证码的图片
        /// </summary>
        /// <param name="containsPage">要输出到的page对象</param>
        /// <param name="validateNum">验证码</param>
        public byte[] CreateValidateGraphic(string validateCode)
        {
            Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 12.0), );
            Graphics g = Graphics.FromImage(image);
            try
            {
                //生成随机生成器
                Random random = new Random();
                //清空图片背景色
                g.Clear(Color.White);
                //画图片的干扰线
                for (int i = ; i < ; i++)
                {
                    int x1 = random.Next(image.Width);
                    int x2 = random.Next(image.Width);
                    int y1 = random.Next(image.Height);
                    int y2 = random.Next(image.Height);
                    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
                }
                Font font = new Font("Arial", , (FontStyle.Bold | FontStyle.Italic));
                LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(, , image.Width, image.Height),
                 Color.Blue, Color.DarkRed, 1.2f, true);
                g.DrawString(validateCode, font, brush, , );
                //画图片的前景干扰点
                for (int i = ; i < ; i++)
                {
                    int x = random.Next(image.Width);
                    int y = random.Next(image.Height);
                    image.SetPixel(x, y, Color.FromArgb(random.Next()));
                }
                //画图片的边框线
                g.DrawRectangle(new Pen(Color.Silver), , , image.Width - , image.Height - );
                //保存图片数据
                MemoryStream stream = new MemoryStream();
                image.Save(stream, ImageFormat.Jpeg);
                //输出图片流
                return stream.ToArray();
            }
            finally
            {
                g.Dispose();
                image.Dispose();
            }
        }
    }
}

LoginController控制器中，新建ValidateCode()方法用于生产验证码。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace Itcast.CMS.WebApp.Controllers
{
    public class LoginController : Controller
    {
        //约定大于配置
        // GET: /Login/

        public ActionResult Index()
        {
            return View();
        }

        /// <summary>
        /// 生产验证码
        /// </summary>
        /// <returns></returns>
        public ActionResult ValidateCode()
        {
            Common.ValidateCode validateCode = new Common.ValidateCode();
            string code = validateCode.CreateValidateCode();//生成验证码
            Session["validateCode"] = code;//存储于Session中
            byte[] buffer = validateCode.CreateValidateGraphic(code);//创建验证码的图片
            return File(buffer, "image/jpeg");
        }
    }
}

视图代码......

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <title>Itcast.CMS后台台管理系统登录</title>
    <script type="text/javascript">
        if (window.parent.window != window) {
            window.top.location.href = "/Home/CheckLogin";
        }
    </script>

    <script src="~/Scripts/jquery-1.8.2.min.js"></script>
    <script src="~/Scripts/jquery.validate.min.js"></script>
    <script src="~/Scripts/jquery.unobtrusive-ajax.min.js"></script>
    <script type="text/javascript">

    </script>

    <style type="text/css">
        * {
            padding: 0;
            margin: 0;
        }

        body {
            text-align: center;
            background: #4974A4;
        }

        #login {
            width: 740px;
            margin: 0 auto;
            font-size: 12px;
        }

        #loginlogo {
            width: 700px;
            height: 100px;
            overflow: hidden;
            background: url('/Content/Images/login/logo.png') no-repeat;
            margin-top: 50px;
        }

        #loginpanel {
            width: 729px;
            position: relative;
            height: 300px;
        }

        .panel-h {
            width: 729px;
            height: 20px;
            background: url('/Content/Images/login/panel-h.gif') no-repeat;
            position: absolute;
            top: 0px;
            left: 0px;
            z-index: 3;
        }

        .panel-f {
            width: 729px;
            height: 13px;
            background: url('/Content/Images/login/panel-f.gif') no-repeat;
            position: absolute;
            bottom: 0px;
            left: 0px;
            z-index: 3;
        }

        .panel-c {
            z-index: 2;
            background: url('/Content/Images/login/panel-c.gif') repeat-y;
            width: 729px;
            height: 300px;
        }

        .panel-c-l {
            position: absolute;
            left: 60px;
            top: 40px;
        }

        .panel-c-r {
            position: absolute;
            right: 20px;
            top: 50px;
            width: 222px;
            line-height: 200%;
            text-align: left;
        }

        .panel-c-l h3 {
            color: #556A85;
            margin-bottom: 10px;
        }

        .panel-c-l td {
            padding: 7px;
        }

        .login-text {
            height: 24px;
            left: 24px;
            border: 1px solid #e9e9e9;
            background: #f9f9f9;
        }

        .login-text-focus {
            border: 1px solid #E6BF73;
        }

        .login-btn {
            width: 114px;
            height: 29px;
            color: #E9FFFF;
            line-height: 29px;
            background: url('/Content/Images/login/login-btn.gif') no-repeat;
            border: none;
            overflow: hidden;
            cursor: pointer;
        }

        #txtUsername, #code, #txtPassword {
            width: 191px;
        }

        #logincopyright {
            text-align: center;
            color: White;
            margin-top: 50px;
        }

        a {
            color: Black;
        }

            a:hover {
                color: Red;
                text-decoration: underline;
            }
    </style>
</head>

<body style="padding: 10px">

    <div id="login">
        <div id="loginlogo">
        </div>
        <div id="loginpanel">
            <div class="panel-h">
            </div>
            <div class="panel-c">
                <div class="panel-c-l">

                        <table cellpadding="0" cellspacing="0">
                            <tbody>
                                <tr>
                                    <td align="left" colspan="2">
                                        <h3>
                                            请使用传智播客CMS系统账号登录
                                        </h3>
                                    </td>
                                </tr>
                                <tr>
                                    <td align="right">
                                        账号：
                                    </td>
                                    <td align="left">
                                        <input type="text" name="LoginCode" id="LoginCode" class="login-text" />

                                    </td>
                                </tr>
                                <tr>
                                    <td align="right">
                                        密码：
                                    </td>
                                    <td align="left">
                                        <input type="password" name="LoginPwd" id="LoginPwd" value="123" class="login-text" />
                                    </td>
                                </tr>
                                <tr>
                                    <td>
                                        验证码：
                                    </td>
                                    <td align="left">
                                        <input type="text" class="login-text" id="code" name="vCode" value="1" />
                                    </td>
                                </tr>
                                <tr>
                                    <td></td>
                                    <td>
                                        <img id="img" src="/Login/ValidateCode/?id=1" style="float: left; height: 24px;" />
                                        <div style="float: left; margin-left: 5px; margin-top: 10px;">
                                            <a href="javascript:void(0)" onclick="changeCheckCode();return false;">看不清，换一张</a>
                                        </div>
                                    </td>
                                </tr>
                                <tr>
                                    <td align="center" colspan="2">
                                        <input type="submit" id="btnLogin" value="登录" class="login-btn" />
                                        <span id="errorMsg"></span>
                                    </td>
                                </tr>
                            </tbody>
                        </table>

                </div>
                <div class="panel-c-r">
                    <p>
                        请从左侧输入登录账号和密码登录
                    </p>
                    <p>
                        如果遇到系统问题，请联系网络管理员。
                    </p>
                    <p>
                        如果没有账号，请联系网站管理员。
                    </p>
                    <p>
                        ......
                    </p>
                </div>
            </div>
            <div class="panel-f">
            </div>
        </div>
        <div id="logincopyright">
            Copyright ? 2012 Yilian.com
        </div>
    </div>
</body>
</html>

视图中img标签显示验证码，src指向Login控制器中的ValidataCode。

<img id="img" src="/Login/ValidateCode/?id=1" style="float: left; height: 24px;" />

验证码看不清，点击重新生产，jquery更改src的属性就行

        function changeCheckCode() {
            var obj = $("#img").attr("src");
            $("#img").attr("src", obj + 1);
        }

****img，css样式等放入Content文件夹中，easyui，jquery等放在Script文件中中