一个用js生成验证码的例子
嗯,今天展示一个简单的js生成验证码的例子吧,挺方便的,
html 如下:
- <!DOCTYPE html>
- <html>
- <head>
- <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 src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
- <script 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>
最后更新于 2021-09-27 17:57:38 并被添加「 js, 验证码」标签,已有 21437 位童鞋阅读过。
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