Html&Javascript生成验证码

来源：互联网发布：网络可用情况发生变化编辑：程序博客网时间：2024/05/09 18:28
<html xmlns="http://www.w3.org/1999/xhtml"><head runat="server">    <title></title>    <meta charset="utf-8" />    <style type="text/css">    .code    {            background:url(code_bg.jpg);            font-family:Arial;            font-style:italic;             color:blue;             font-size:30px;             border:0;             padding:2px 3px;             letter-spacing:3px;             font-weight:bolder;                          float:left;                         cursor:pointer;             width:150px;             height:60px;             line-height:60px;             text-align:center;             vertical-align:middle;    }    a    {        text-decoration:none;        font-size:12px;        color:#288bc4;        }    a:hover    {       text-decoration:underline;        }    </style>    <script language="javascript" type="text/javascript">        var code;        function createCode() {            code = "";            var codeLength = 6; //验证码的长度            var checkCode = document.getElementById("checkCode");            var codeChars = new Array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9,             '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'); //所有候选组成验证码的字符，当然也可以用中文的            for (var i = 0; i < codeLength; i++)             {                var charNum = Math.floor(Math.random() * 52);                code += codeChars[charNum];            }            if (checkCode)             {                checkCode.className = "code";                checkCode.innerHTML = code;            }        }        function validateCode()         {            var inputCode = document.getElementById("inputCode").value;            if (inputCode.length <= 0)             {                alert("请输入验证码！");            }            else if (inputCode.toUpperCase() != code.toUpperCase())             {                alert("验证码输入有误！");                createCode();            }            else             {                alert("验证码正确！");            }                }         </script></head><body onload="createCode()">    <form id="form1" runat="server" onsubmit="validateCode()">    <div>    <table border="0" cellspacing="5" cellpadding="5" >        <tr>            <td></td><td> <div class="code" id="checkCode" onclick="createCode()" ></div></td>            <td><a  href="#" onclick="createCode()">看不清换一张</a></td>        </tr>        <tr>            <td>验证码：</td><td><input  style="float:left;" type="text"   id="inputCode" /></td><td>请输入验证码</td>        </tr>        <tr><td></td><td><input id="Button1"  onclick="validateCode();" type="button" value="确定" /></td><td></td>        </tr>    </table>    </div>    </form></body></html>
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