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.net MVC4一个登陆界面加验证

Model

  1 using System;
  2 using System.Collections.Generic;
  3 using System.IO;
  4 using System.Linq;
  5 using System.Security.Cryptography;
  6 using System.Text;
  7 using System.Threading.Tasks;
  8 using System.Web;
  9 
 10 namespace VerificationCode.Code
 11 {
 12     public class VerificationCodeAESHelp
 13     {
 14         /// <summary>
 15         /// Key123Ace#321Key
 16         /// </summary>
 17         private static readonly string _AESKEY = "qwertyuiopasdfghjklzxcvbnm123456";
 18 
 19         /// <summary>
 20         /// slide
 21         /// </summary>
 22         public const string _SlideCode = "slidecode.";
 23 
 24         /// <summary>
 25         ///验证码cookie
 26         /// </summary>
 27         public const string _YZM = "_YZM.";
 28 
 29 
 30         private HttpContextBase _httpContextAccessor;
 31 
 32         public VerificationCodeAESHelp(HttpContextBase httpContextAccessor)
 33         {
 34             this._httpContextAccessor = httpContextAccessor;
 35         }
 36 
 37 
 38         /// <summary>
 39         /// AES加密返回base64字符串
 40         /// </summary>
 41         public string AES_Encrypt_Return_Base64String(string str)
 42         {
 43             string base64Str = AESEncrypt(str, _AESKEY);
 44 
 45             return base64Str;
 46         }
 47 
 48 
 49         /// <summary>
 50         /// AES解密返回string
 51         /// </summary>
 52         public string AES_Decrypt_Return_String(string str)
 53         {
 54             return AESDecrypt(str, _AESKEY);
 55         }
 56 
 57 
 58 
 59         #region AES
 60 
 61         private static string SubString(string sourceStr, int startIndex, int length)
 62         {
 63             string str;
 64             if (string.IsNullOrEmpty(sourceStr))
 65             {
 66                 str = "";
 67             }
 68             else
 69             {
 70                 str = (sourceStr.Length < startIndex + length ? sourceStr.Substring(startIndex) : sourceStr.Substring(startIndex, length));
 71             }
 72             return str;
 73         }
 74 
 75 
 76         private static byte[] _aeskeys = new byte[] { 18, 52, 86, 120, 144, 171, 205, 239, 18, 52, 86, 120, 144, 171, 205, 239 };
 77         /// <summary>
 78         /// 加密
 79         /// </summary>
 80         /// <param name="input"></param>
 81         /// <param name="key"></param>
 82         /// <returns></returns>
 83         private static string AESEncrypt(string encryptStr, string encryptKey)
 84         {
 85 
 86             string base64String;
 87             if (!string.IsNullOrWhiteSpace(encryptStr))
 88             {
 89                 encryptKey = SubString(encryptKey, 0, 32);
 90                 encryptKey = encryptKey.PadRight(32, ' ');
 91                 SymmetricAlgorithm bytes = Rijndael.Create();
 92                 byte[] numArray = Encoding.UTF8.GetBytes(encryptStr);
 93                 bytes.Key = Encoding.UTF8.GetBytes(encryptKey);
 94                 bytes.IV = _aeskeys;
 95                 byte[] array = null;
 96                 MemoryStream memoryStream = new MemoryStream();
 97                 try
 98                 {
 99                     CryptoStream cryptoStream = new CryptoStream(memoryStream, bytes.CreateEncryptor(), CryptoStreamMode.Write);
100                     try
101                     {
102                         cryptoStream.Write(numArray, 0, numArray.Length);
103                         cryptoStream.FlushFinalBlock();
104                         array = memoryStream.ToArray();
105                         cryptoStream.Close();
106                         memoryStream.Close();
107                     }
108                     finally
109                     {
110                         if (cryptoStream != null)
111                         {
112                             ((IDisposable)cryptoStream).Dispose();
113                         }
114                     }
115                 }
116                 finally
117                 {
118                     if (memoryStream != null)
119                     {
120                         ((IDisposable)memoryStream).Dispose();
121                     }
122                 }
123                 base64String = Convert.ToBase64String(array);
124             }
125             else
126             {
127                 base64String = string.Empty;
128             }
129             return base64String;
130 
131         }
132 
133 
134 
135         /// <summary>
136         /// 解密
137         /// </summary>
138         /// <param name="input"></param>
139         /// <param name="key"></param>
140         /// <returns></returns>
141         private static string AESDecrypt(string decryptStr, string decryptKey)
142         {
143 
144             string empty;
145             if (!string.IsNullOrWhiteSpace(decryptStr))
146             {
147                 decryptKey = SubString(decryptKey, 0, 32);
148                 decryptKey = decryptKey.PadRight(32, ' ');
149                 byte[] numArray = Convert.FromBase64String(decryptStr);
150                 SymmetricAlgorithm bytes = Rijndael.Create();
151                 bytes.Key = Encoding.UTF8.GetBytes(decryptKey);
152                 bytes.IV = _aeskeys;
153                 byte[] numArray1 = new byte[numArray.Length];
154                 MemoryStream memoryStream = new MemoryStream(numArray);
155                 try
156                 {
157                     CryptoStream cryptoStream = new CryptoStream(memoryStream, bytes.CreateDecryptor(), CryptoStreamMode.Read);
158                     try
159                     {
160                         cryptoStream.Read(numArray1, 0, numArray1.Length);
161                         cryptoStream.Close();
162                         memoryStream.Close();
163                     }
164                     finally
165                     {
166                         if (cryptoStream != null)
167                         {
168                             ((IDisposable)cryptoStream).Dispose();
169                         }
170                     }
171                 }
172                 finally
173                 {
174                     if (memoryStream != null)
175                     {
176                         ((IDisposable)memoryStream).Dispose();
177                     }
178                 }
179                 empty = Encoding.UTF8.GetString(numArray1).Replace("", "");
180             }
181             else
182             {
183                 empty = string.Empty;
184             }
185             return empty;
186 
187         }
188 
189         #endregion
190 
191 
192         #region  Cookie
193 
194         /// <summary>
195         /// 
196         /// </summary>
197         /// <param name="key"></param>
198         /// <param name="value"></param>
199         /// <param name="minute"></param>
200         public void SetCookie(HttpContextBase httpContext,string key, string value, int minute)
201         {
202 
203             HttpCookie cookie = new HttpCookie(key);
204             cookie.Value = value;
205             cookie.Expires = DateTime.Now.AddDays(minute);
206             httpContext.Response.Cookies.Add(cookie);
207         }
208 
209 
210 
211         /// <summary>
212         /// 
213         /// </summary>
214         /// <param name="key"></param>
215         /// <returns>string</returns>
216         public string GetCookie(HttpContextBase httpContext,string key)
217         {
218             string _cookie = httpContext.Request.Cookies[key].Value;
219             return _cookie;
220         }
221 
222 
223 
224         #endregion
225     }
226 }

VerificationCodeAESHelp

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Drawing;
  4 using System.Drawing.Imaging;
  5 using System.IO;
  6 using System.Linq;
  7 using System.Threading.Tasks;
  8 
  9 namespace VerificationCode.Code
 10 {
 11     public class VerificationCodeImage
 12     {
 13 
 14         /// <summary>  
 15         /// 随机汉字
 16         /// </summary>  
 17         /// <param name="number"></param>  
 18         /// <returns></returns>  
 19         private static string RandomHanZi(int number)
 20         {
 21             var str = "奉利民邱喜威刘鹏李明洋李国霜";
 22             char[] str_char_arrary = str.ToArray();
 23             Random rand = new Random();
 24             HashSet<string> hs = new HashSet<string>();
 25             bool randomBool = true;
 26             while (randomBool)
 27             {
 28                 if (hs.Count == number)
 29                     break;
 30                 int rand_number = rand.Next(str_char_arrary.Length);
 31                 hs.Add(str_char_arrary[rand_number].ToString());
 32             }
 33             string code = string.Join("", hs);
 34             return code;
 35         }
 36 
 37         /// <summary>  
 38         /// </summary>  
 39         /// <param name="numbers">生成位数（默认5位）</param>  
 40         /// <param name="_height">图片高度</param>  
 41         /// <param name="_width">图片宽度</param>  
 42         public static Task<VerificationCodeModel> CreateHanZi(int numbers = 5, int _height = 200, int _width = 200)
 43         {
 44             var imageModel = new VerificationCodeModel();
 45             if (imageModel.point_X_Y == null)
 46             {
 47                 imageModel.point_X_Y = new List<Point_X_Y>();
 48             }
 49             string code = RandomHanZi(numbers);
 50             Bitmap Img = null;
 51             Graphics g = null;
 52             MemoryStream ms = null;
 53             Random random = new Random();
 54 
 55             Color[] color_Array = { Color.Black, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
 56             string[] fonts = { "lnk Free", "Segoe Print", "Comic Sans MS", "MV Boli", "华文行楷" };
 57             //string _base = Environment.CurrentDirectory + "\wwwroot\verificationcodeImage\";
 58             string _base = System.Web.HttpContext.Current.Server.MapPath("~/CallWebLog/");
 59             if (!System.IO.Directory.Exists(_base))
 60             {
 61                 System.IO.Directory.CreateDirectory(_base);
 62             }
 63             var _file_List = System.IO.Directory.GetFiles(_base);
 64             int imageCount = _file_List.Length;
 65             if (imageCount == 0)
 66                 throw new Exception("image not Null");
 67 
 68             int imageRandom = random.Next(1, (imageCount + 1));
 69             string _random_file_image = _file_List[imageRandom - 1];
 70             var imageStream = Image.FromFile(_random_file_image);
 71 
 72             Img = new Bitmap(imageStream, _width, _height);
 73             imageStream.Dispose();
 74             g = Graphics.FromImage(Img);
 75             Color[] penColor = { Color.LightGray, Color.Green, Color.Blue };
 76             int code_length = code.Length;
 77             for (int i = 0; i < code_length; i++)
 78             {
 79                 int cindex = random.Next(color_Array.Length);
 80                 int findex = random.Next(fonts.Length);
 81                 Font f = new Font(fonts[findex], 15, FontStyle.Bold);
 82                 Brush b = new SolidBrush(color_Array[cindex]);
 83                 int _y = random.Next(_height);
 84                 if (_y > (_height - 30))
 85                     _y = _y - 60;
 86 
 87                 int _x = _width / (i + 1);
 88                 if ((_width - _x) < 50)
 89                 {
 90                     _x = _width - 60;
 91                 }
 92                 string word = code.Substring(i, 1);
 93                 if (imageModel.point_X_Y.Count < 3)
 94                 {
 95                     imageModel.point_X_Y.Add(new Point_X_Y()
 96                     {
 97                         Word = word,
 98                         _X = _x,
 99                         _Y = _y,
100                         Sort = i
101                     });
102                 }
103                 g.DrawString(word, f, b, _x, _y);
104             }
105             ms = new MemoryStream();
106             Img.Save(ms, ImageFormat.Jpeg);
107             g.Dispose();
108             Img.Dispose();
109             ms.Dispose();
110             imageModel.ImageBase64Str = "data:image/jpg;base64," + Convert.ToBase64String(ms.GetBuffer());
111             return Task.FromResult(imageModel);
112         }
113 
114 
115 
116     }
117 
118 
119     public class Point_X_Y
120     {
121         public int _X { get; set; }
122 
123         public int _Y { get; set; }
124 
125         public int Sort { get; set; }
126 
127         public string Word { get; set; }
128 
129     }
130 
131     /// <summary>
132     /// 滑动校验
133     /// </summary>
134     public class SlideVerifyCodeModel
135     {
136         public bool SlideCode { get; set; }
137 
138         public DateTime timestamp
139         {
140             get { return DateTime.Now; }
141             set
142             {
143                
144             }
145         }
146     }
147 
148 
149     public class VerificationCodeModel
150     {
151         public string ImageBase64Str { get; set; }
152 
153         public List<Point_X_Y> point_X_Y { get; set; }
154 
155     }
156 
157 }

VerificationCodeImage

Controllers

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Diagnostics;
  4 using System.Linq;
  5 using System.Threading.Tasks;
  6 using System.Web;
  7 using System.Web.Mvc;
  8 using VerificationCode.Code;
  9 
 10 namespace Zeujs.Controllers
 11 {
 12     public class DefaultController : Controller
 13     {
 14 
 15         private VerificationCodeAESHelp _verificationCodeAESHelp;
 16 
 17         /// <summary>
 18         /// 构造函数
 19         /// </summary>
 20         public DefaultController()
 21         {
 22             this._verificationCodeAESHelp = new VerificationCodeAESHelp(HttpContext);
 23         }
 24 
 25         public ActionResult GetVerificationCodeImage()
 26         {
 27             var model = VerificationCode.Code.VerificationCodeImage.CreateHanZi();
 28             VerificationCodeAESHelp help = new VerificationCodeAESHelp(HttpContext);
 29             var json_Model = Newtonsoft.Json.JsonConvert.SerializeObject(model.Result.point_X_Y);
 30             string pointBase64str = help.AES_Encrypt_Return_Base64String(json_Model);
 31             help.SetCookie(HttpContext, VerificationCodeAESHelp._YZM, pointBase64str, 5);
 32             string msg = "请根据顺序点击【" + string.Join("", model.Result.point_X_Y.Select(x => x.Word).ToList()) + "】";
 33             return Json(new { result = model.Result.ImageBase64Str, msg = msg });
 34         }
 35 
 36         public ActionResult CheckCode(string code)
 37         {
 38             try
 39             {
 40                 if (this._verificationCodeAESHelp == null)
 41                 {
 42                     this._verificationCodeAESHelp = new VerificationCodeAESHelp(HttpContext);
 43                 }
 44                 var pointList = new List<Point_X_Y>();
 45                 try
 46                 {
 47                     pointList = Newtonsoft.Json.JsonConvert.DeserializeObject<List<Point_X_Y>>(code);
 48                 }
 49                 catch (Exception)
 50                 {
 51                     return Json(new { msg = "验证失败!", status = "error" });
 52                 }
 53 
 54                 if (pointList.Count != 3)
 55                     return Json(new { msg = "验证失败!", status = "error" });
 56 
 57                 var _cookie = this._verificationCodeAESHelp.GetCookie(HttpContext, VerificationCodeAESHelp._YZM);
 58 
 59                 if (string.IsNullOrEmpty(_cookie))
 60                     return Json(new { msg = "验证失败!", status = "error" });
 61 
 62                 string _str = this._verificationCodeAESHelp.AES_Decrypt_Return_String(_cookie);
 63 
 64                 var _cookiesPointList = Newtonsoft.Json.JsonConvert.DeserializeObject<List<Point_X_Y>>(_str);
 65                 _cookiesPointList = _cookiesPointList.OrderBy(x => x.Sort).ToList();
 66                 int i = 0;
 67                 foreach (var item in pointList.AsParallel())
 68                 {
 69                     int _x = _cookiesPointList[i]._X - item._X;
 70                     int _y = _cookiesPointList[i]._Y - item._Y;
 71                     _x = Math.Abs(_x);
 72                     _y = Math.Abs(_y);
 73                     if (_x > 25 || _y > 25)
 74                     {
 75                         return Json(new { msg = "验证失败!", status = "error" });
 76                     }
 77                     i++;
 78                 }
 79 
 80                 SlideVerifyCode(true);
 81 
 82             }
 83             catch (Exception)
 84             {
 85                 return Json(new { msg = "验证失败!", status = "error" });
 86             }
 87             return Json(new { msg = "验证通过!", status = "ok" });
 88         }
 89 
 90 
 91 
 92         [HttpPost]
 93         public ActionResult Logins(string userName, string passWord)
 94         {
 95             Tuple<bool, string> tuple = VerifyValiate();
 96             if (!tuple.Item1)
 97             {
 98                 return Json(new { msg = tuple.Item2, status = "error" });
 99             }
100             if (userName == "admin" && passWord == "admin")
101             {
102                 return Json(new { msg = "登陆成功!", status = "ok" });
103             }
104             else
105             {
106                 return Json(new { msg = "账号密码错误!", status = "error" });
107             }
108         }
109 
110         public Tuple<bool, string> VerifyValiate()
111         {
112             var _cookie = this._verificationCodeAESHelp.GetCookie(HttpContext, VerificationCodeAESHelp._SlideCode);
113             if (string.IsNullOrEmpty(_cookie))
114             {
115                 SlideVerifyCode();
116                 return new Tuple<bool, string>(false, "请拖动滑块");
117             }
118             string _str = this._verificationCodeAESHelp.AES_Decrypt_Return_String(_cookie);
119             var sildeCodeModel = Newtonsoft.Json.JsonConvert.DeserializeObject<SlideVerifyCodeModel>(_str);
120             if (!sildeCodeModel.SlideCode)
121             {
122                 return new Tuple<bool, string>(false, "请拖动滑块后点击汉字");
123             }
124             var _NowTime = DateTime.Now;
125             var _time = sildeCodeModel.timestamp;
126             var number = (_NowTime - _time).Minutes;
127             if (number > 5)
128             {
129                 SlideVerifyCode();
130                 return new Tuple<bool, string>(false, "滑块验证码过期");
131             }
132             return new Tuple<bool, string>(true, "成功");
133         }
134 
135 
136         private void SlideVerifyCode(bool _bool = false)
137         {
138             var json = Newtonsoft.Json.JsonConvert.SerializeObject(new SlideVerifyCodeModel() { SlideCode = _bool, timestamp = DateTime.Now });
139             string base64Str = this._verificationCodeAESHelp.AES_Encrypt_Return_Base64String(json);
140             this._verificationCodeAESHelp.SetCookie(HttpContext, VerificationCodeAESHelp._SlideCode, base64Str, 10);
141 
142         }
143 
144 
145 
146     }
147 }

Home

View

  1 @{
  2     ViewData["Title"] = "Home Page";
  3     Layout = null;
  4 }
  5 
  6 <!DOCTYPE html>
  7 <html>
  8 <head>
  9     <meta charset="utf-8" />
 10     <title>登录 </title>
 11 
 12     <link href="~/wwwroot/css/style.css" rel="stylesheet" />
 13     <link href="~/wwwroot/css/slide-unlock.css" rel="stylesheet" />
 14 
 15     <style>
 16         body {
 17             height: 100%;
 18             background: #16a085; 
 19             overflow: hidden;
 20         }
 21 
 22         canvas {
 23             z-index: -1;
 24             position: absolute;
 25         }
 26     </style>
 27     <script src="~/wwwroot/js/jquery1.11.1.js"></script>
 28 
 29     <script src="/wwwroot/js/Particleground.js" tppabs="js/Particleground.js"></script>
 30     <script src="~/wwwroot/js/slide.js"></script>
 31 
 32     <script>
 33 
 34         $(document).ready(function () {
 35 
 36             $(".submit_btn").click(function () {
 37                 if ($("#labelTip").html() == "拖动滑块验证")
 38                 {
 39                     alert("请拖动滑块验证！");
 40                     return;
 41                 }
 42                 $.ajax({
 43                     url: "@Url.Action("Logins", "default")",
 44                     type: "post",
 45                     data: {
 46                         "userName": $("#userName").val(),
 47                         "passWord": $("#passWord").val()
 48                     },
 49                     success: function (d) {
 50                         if (d.status != "ok") {
 51                             alert(d.msg);
 52                             Slider_init();
 53                         } else {
 54                             alert(d.msg);
 55                             window.location.href = "@Url.Action("index")";
 56                         }
 57                     }
 58                 })
 59 
 60 
 61             })
 62 
 63 
 64             //粒子背景特效
 65             $('body').particleground({
 66                 dotColor: '#5cbdaa',
 67                 lineColor: '#5cbdaa'
 68             });
 69 
 70             Slider_init();
 71         });
 72 
 73 
 74         function Slider_init() {
 75             var slider = new SliderUnlock("#slider", {
 76                 successLabelTip: "验证成功"
 77             }, function () {
 78 
 79                 huadongCode();
 80             });
 81             slider.init();
 82         }
 83 
 84 
 85 
 86         function huadongCode() {
 87             num = 1;
 88             checkCode = [];
 89             $.ajax({
 90                 type: "Post",
 91                 url: "@Url.Action("GetVerificationCodeImage", "Default")",
 92                 dataType: "json",
 93                 beforeSend: function (XMLHttpRequest) {
 94                     console.log(this);
 95 
 96                 },
 97                 success: function (data) {
 98                     var html = "<div id="imagediv" style='position: absolute;left:10px; top:30px;background: #fff;z-index:300'><img src=" + data.result + " alt="看不清？点击更换" id="image"/></div>";
 99                     html += "<div id='divrefresh' style='20px;height:20px;position:absolute;cursor: pointer;margin-left: 90%;'> <img src="/wwwroot/images/shaxin.jpg" /> </div>";
100                     $("#huadongImage").css("display", "block").html(html);
101                     $("#labelTip").html(data.msg);
102                     imageClick();
103                     divrefreshClick();
104 
105                 }
106             })
107 
108 @*            $.ajax({
109                 "url": "@Url.Action("GetVerificationCodeImage","Default")",
110                 "type": "get",
111                 "success": function (data) {
112                     var html = "<div id="imagediv" style='position: absolute;left:10px; top:30px;background: #fff;z-index:300'><img src=" + data.result + " alt="看不清？点击更换" id="image"/></div>";
113                     html += "<div id='divrefresh' style='20px;height:20px;position:absolute;cursor: pointer;margin-left: 90%;'> <img src="/images/shaxin.jpg" /> </div>";
114                     $("#huadongImage").css("display", "block").html(html);
115                     $("#labelTip").html(data.msg);
116                     imageClick();
117                     divrefreshClick();
118                 },
119                 "complete": function (XMLHttpRequest, status) {
120                     if (status == 'timeout') {
121 
122                     }
123                     alert("1");
124                 }
125             })*@
126         }
127 
128 
129         function divrefreshClick() {
130             $("#divrefresh").click(function () {
131                 huadongCode();
132                 num = 1;
133                 checkCode = [];
134             })
135         }
136 
137 
138         var num = 1;
139         var checkCode = [];
140         function createPoint(pos) {
141             if (num == 3) {
142                 PostcheckCode();
143             }
144 
145             $("#imagediv").append('<div class="point-area" onclick="pointClick(this)" style="background-color:#539ffe;color:#fff;z-index:9999;25px;height:25px;text-align:center;line-height:25px;border-radius: 20%;position:absolute;border:2px solid white;top:' + parseInt(pos.y - 10) + 'px;left:' + parseInt(pos.x - 10) + 'px;">' + num + '</div>');
146             ++num;
147         }
148 
149 
150 
151         function PostcheckCode() {
152             $.ajax({
153                 "url": "/Default/CheckCode",
154                 "type": "post",
155                 "data": {
156                     "code": JSON.stringify(checkCode)
157                 },
158                 "success": function (d) {
159                     if (d.status == "ok") {
160                         $("#labelTip").html(d.msg);
161                         $("#huadongImage").hide();
162                     } else {
163                         huadongCode();
164                     }
165                 },
166                 "error": function (error) {
167 
168                 }
169             })
170 
171         }
172 
173 
174 
175         function pointClick(obj) {
176             num = 1;
177             checkCode = [];
178             $(obj).parent().find('.point-area').remove();
179         }
180 
181 
182         function getMousePos(obj, event) {
183             var e = event || window.event;
184             var x = e.clientX - ($(obj).offset().left - $(window).scrollLeft());
185             var y = e.clientY - ($(obj).offset().top - $(window).scrollTop());
186             checkCode.push({ "_X": parseInt(x), "_Y": parseInt(y) });
187             return { 'x': parseInt(x), 'y': parseInt(y) };
188         }
189 
190         function imageClick() {
191             $("#imagediv").click(function () {
192                 var _this = $(this);
193                 var pos = getMousePos(_this);
194                 createPoint(pos);
195             })
196 
197         }
198     </script>
199 </head>
200 <body>
201         <dl class="admin_login">
202             <dt>
203                 <strong>登录</strong>
204                 <em></em>
205             </dt>
206             <dd class="user_icon">
207                 <input type="text" id="userName" placeholder="账号" class="login_txtbx" name="userName" data-val="true" data-val-required="賬號不能为空" />
208                 <span class="field-validation-valid" data-valmsg-for="userName" data-valmsg-replace="true" style="color: #ff0000"></span>
209             </dd>
210             <dd class="pwd_icon">
211                 <input type="password" id="passWord" placeholder="密码" class="login_txtbx" />
212             </dd>
213             <dd class="val_icon">
214                 <div id="slider">
215                     <div id="slider_bg"></div>
216                     <span id="label">>></span>
217                     <span id="labelTip">拖动滑块验证</span>
218                 </div>
219 
220                 <div id="huadongImage" style=" 300px; border: 1px solid #ccc; height: 250px; z-index: 200; display: none; position: absolute; background-color: white; top: 40px;">
221                 </div>
222             </dd>
223             <dd>
224                 <input type="submit" value="立即登陆" class="submit_btn" />
225             </dd>
226             <dd></dd>
227         </dl>
228 </body>
229 </html>

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样式请去http://www.bootcss.com/下载

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原文地址：https://www.cnblogs.com/flms/p/9593372.html