JS 怎么制作数字、字母、汉字混合的验证码
发布网友
发布时间：2022-04-24 10:03
共3个回答
懂视网
时间：2022-04-20 11:51
验证码（CAPTCHA）是“Completely Automated Public Turing test to tell Computers and Humans Apart”（全自动区分计算机和人类的图灵测试）的缩写，是一种区分用户是计算机还是人的公共全自动程序。可以防止：恶意破解密码、刷票、论坛灌水，有效防止某个黑客对某一个特定注册用户用特定程序暴力破解方式进行不断的登陆尝试，实际上用验证码是现在很多网站通行的方式，我们利用比较简易的方式实现了这个功能。这个问题可以由计算机生成并评判，但是必须只有人类才能解答。由于计算机无法解答CAPTCHA的问题，所以回答出问题的用户就可以被认为是人类这篇文章主要为大家详细介绍了js随机验证码的实现代码，具体内容如下
验证码：
<html>
<head>
<title>纯字验证码</title>
<meta http-equiv='content-type' content='text/html;charset=utf-8'/>
<script type='text/javascript' src='jquery-1.7.2.js'></script>
<script type='text/javascript'>
var code ; //在全局定义验证码
function createCode(){
code = "";
var codeLength = 4;//验证码的长度
var checkCode = document.getElementById("code");
var random = 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');//随机数
for(var i = 0; i < codeLength; i++) {//循环操作
var index = Math.floor(Math.random()*36);//取得随机数的索引（0~35）
code += random[index];//根据索引取得随机数加到code上
}
checkCode.value = code;//把code值赋给验证码
}
//校验验证码
function validate(){
var inputCode = document.getElementById("input").value.toUpperCase(); //取得输入的验证码并转化为大写
if(inputCode.length <= 0) { //若输入的验证码长度为0
alert("请输入验证码！"); //则弹出请输入验证码
}else if(inputCode != code ) { //若输入的验证码与产生的验证码不一致时
alert("验证码输入错误！@_@"); //则弹出验证码输入错误
createCode();//刷新验证码
document.getElementById("input").value = "";//清空文本框
}else { //输入正确时
alert("合格！^-^");
}
}
</script>
<style type='text/css'>
#code{
font-family:Arial,宋体;
font-style:italic;
color:green;
border:0;
padding:2px 3px;
letter-spacing:3px;
font-weight:bolder;
}
</style>
</head>
<body onload='createCode()'>
<p>验证码：
<input type = "text" id = "input"/>
<input type="button" id="code" onclick="createCode()" style="width:60px" title='点击更换验证码' />
<input type = "button" value = "验证" onclick = "validate()"/>
</p>
</body>
</html>
热心网友
时间：2022-04-20 08:59
/***************************************************/
/**效果倒是出来了,但是不是十分好看*********/
/**建议还是单选汉字或者去掉汉字看看*******/
/**************************************************/
<html>
<head>
<style type="text/css">
.code{
background-image:url(code.jpg);
font-family:Arial;
font-style:italic;
color:Red;
border:0;
padding:2px 3px;
letter-spacing:3px;
font-weight:bolder;
}
.unchanged {
border:0;
}
</style>
<script language="javascript" type="text/javascript">
var code ; //在全局 定义验证码
function createCode(){
code = "";
var codeLength = 100;//验证码的长度
var checkCode = document.getElementById("checkCode");
checkCode.value = "";
var selectChar = new Array(2,3,4,5,6,7,8,9,'A','B','C','D','E','F','G','H','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z','\u7684','\u4e00','\u4e86','\u662f','\u6211','\u4e0d','\u5728','\u4eba','\u4eec','\u6709','\u6765','\u4ed6','\u8fd9','\u4e0a','\u7740','\u4e2a','\u5730','\u5230','\u5927','\u91cc','\u8bf4','\u5c31','\u53bb','\u5b50','\u5f97','\u4e5f','\u548c','\u90a3','\u81','\u4e0b','\u770b','\u5929','\u65f6','\u8fc7','\u51fa','\u5c0f','\u4e48','\u8d77','\u4f60','\u90fd','\u628a','\u597d','\u8fd8','\u591a','\u6ca1','\u4e3a','\u53c8','\u53ef','\u5bb6','\u5b66','\u53ea','\u4ee5','\u4e3b','\u4f1a','\u6837','\u5e74','\u60f3','\u751f','\u540c','\u8001','\u4e2d','\u5341','\u4ece','\u81ea','\u9762','\u524d','\u5934','\u9053','\u5b83','\u540e','\u7136','\u8d70','\u5f88','\u50cf','\uc1','\u4e24','\u7528','\u5979','\u56fd','\u52a8','\u8fdb','\u6210','\u56de','\u4ec0','\u8fb9','\u4f5c','\u5bf9','\u5f00','\u800c','\u5df1','\u4e9b','\u73b0','\u5c71','\u6c11','\u5019','\u7ecf','\u53d1','\u5de5','\u5411','\u4e8b','\u547d','\u7ed9','\u957f','\u6c34','\u51e0','\u4e49','\u4e09','\u58f0','\u4e8e','\u9ad8','\u624b','\u77e5','\u7406','\u773c','\u5fd7','\u70b9','\u5fc3','\u6218','\u4e8c','\u95ee','\u4f46','\u8eab','\u65b9','\u5b9e','\u5403','\u505a','\u53eb','\u5f53','\u4f4f','\u542c','\u9769','\u6253','\u5462','\u771f','\u5168','\u624d','\u56db','\u5df2','\u6240','\u654c','\u4e4b','\u6700','\u5149','\u4ea7','\u60c5','\u8def','\u5206','\u603b','\u6761','\u767d','\u8bdd','\u4e1c','\u5e2d','\u6b21','\u4eb2','\u5982','\u88ab','\u82b1','\u53e3','\u653e','\u513f','\u5e38','\u6c14','\u4e94','\u7b2c','\u4f7f','\u5199','\u519b','\u5427','\u6587','\u8fd0','\u518d','\u679c','\u600e','\u5b9a','\u8bb8','\u5feb','\u660e','\u884c','\u56e0','\u522b','\u98de','\u5916','\u6811','\u7269','\u6d3b','\u90e8','\u95e8','\u65e0','\u5f80','\u8239','\u671b','\u65b0','\u5e26','\u961f','\u5148','\u529b','\u5b8c','\u5374','\u7ad9','\u4ee3','\u5458','\u673a','\u66f4','\u4e5d','\u60a8','\u6bcf','\u98ce','\u7ea7','\u8ddf','\u7b11','\u554a','\u5b69','\u4e07','\u5c11','\u76f4','\u610f','\u591c','\u6bd4','\u9636','\u8fde','\u8f66','\u91cd','\u4fbf','\u6597','\u9a6c','\u54ea','\u5316','\u592a','\u6307','\u53d8','\u793e','\u4f3c','\u58eb','\u8005','\u5e72','\u77f3','\u6ee1','\u65e5','\u51b3','\u767e','\u539f','\u62ff','\u7fa4','\u7a76','\u5404','\u516d','\u672c','\u601d','\ue3','\u7acb','\u6cb3','\u6751','\u516b','\u96be','\u65e9','\u8bba','\u5417','\u6839','\u5171','\u8ba9','\u76f8','\u7814','\u4eca','\u5176','\u4e66','\u5750','\u63a5','\u5e94','\u5173','\u4fe1','\uc9','\u6b65','\u53cd','\u5904','\u8bb0','\u5c06','\u5343','\u627e','\u4e','\u9886','\u6216','\u5e08','\u7ed3','\u5757','\u8dd1','\u8c01','\u8349','\u8d8a','\u5b57','\u52a0','\u811a','\u7d27','\u7231','\u7b49','\u4e60','\u9635','\u6015','\u6708','\u9752','\u534a','\u706b','\u6cd5','\u98','\u5efa','\u8d76','\u4f4d','\u5531','\u6d77','\u4e03','\u5973','\u4efb','\u4ef6','\u611f','\u51c6','\u5f20','\u56e2','\u5c4b','\u79bb','\u8272','\u8138','\u7247','\u79d1','\u5012','\u775b','\u5229','\u4e16','\u521a','\u4e14','\u7531','\u9001','\u5207','\u661f','\u5bfc','\u665a','\u8868','\u591f','\u6574','\u8ba4','\u54cd','\u96ea','\u6d41','\u672a','\u573a','\u8be5','\u5e76','\u5e95','\u6df1','\u523b','\u5e73','\u4f1f','\u5fd9','\u63d0','\u786e','\u8fd1','\u4eae','\u8f7b','\u8bb2','\u519c','\u53e4','\u9ed1','\u544a','\u754c','\u62c9','\u540d','\u5440','\u571f','\u6e05','\u9633','\u7167','\u529e','\u53f2','\u6539','\u5386','\u8f6c','\u753b','\u9020','\u5634','\u6b','\u6cbb','\u5317','\u5fc5','\u670d','\u96e8','\u7a7f','\u5185','\u8bc6','\u9a8c','\u4f20','\u4e1a','\u83dc','\u722c','\u7761','\u5174','\u5f62','\u91cf','\u54b1','\uc2','\u82e6','\u4f53','\u4f17','\u901a','\u51b2','\u5408','\u7834','\u53cb','\u5ea6','\u672f','\u996d','\u516c','\u65c1','\u623f','\u6781','\u5357','\u67aa','\u8bfb','\u6c99','\u5c81','\u7ebf','\u91ce','\u575a','\u7a7a','\u6536','\u7b97','\u81f3','\u653f','\u57ce','\u52b3','\u843d','\u94b1','\u7279','\u56f4','\u5f1f','\u80dc','\u6559','\u70ed','\u5c55','\u5305','\u6b4c','\u7c7b','\u6e10','\u5f3a','\u6570','\u4e61','\u547c','\u6027','\u97f3','\u7b54','\u54e5','\u95','\u65e7','\u795e','\u5ea7','\u7ae0','\u5e2e','\u5566','\u53d7','\u7cfb','\u4ee4','\u8df3','\u975e','\u4f55','\u725b','\u53d6','\u5165','\u5cb8','\u6562','\u63','\u5ffd','\u79cd','\u88c5','\u9876','\u6025','\u6797','\u505c','\u606f','\u53e5','\u533a','\u8863','\u822c','\u62a5','\u53f6','\u538b','\u6162','\u53d4','\u80cc','\u7ec6');
for(var i=0;i<codeLength;i++) {
var charIndex = Math.floor(Math.random()*550);
code +=selectChar[charIndex];
}
if(code.length != codeLength){
createCode();
}
checkCode.value = code;
}
function validate () {
var inputCode = document.getElementById("input1").value.toUpperCase();
if(inputCode.length <=0) {
alert("请输入验证码！");
return false;
}
else if(inputCode != code ){
alert("验证码输入错误！");
createCode();
return false;
}
else {
alert("OK");
return true;
}
}
</script>
</head>
<body onload="createCode();">
<input type="text" id="input1" />
<input type="text" id="checkCode" class="code" style="width: 1000px" /> <a href="#" onclick="createCode()">看不清楚</a><input id="Button1" onclick="validate();" type="button" value="确定" />
<script></script>
</body>
</html>
热心网友
时间：2022-04-20 10:17
这个我到是没有写过，但是我可以在后台程序里写上验证码得原代码，再由JS去调用。源代码写上..import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;public class CheckCodeServlet extends HttpServlet {
public void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("image/jpeg");
BufferedImage image = new BufferedImage(60, 20,
BufferedImage.TYPE_INT_RGB);
Random r = new Random();
Graphics g = image.getGraphics();
g.setColor(new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255)));
g.fillRect(0, 0, 60, 20);
g.setColor(new Color(0, 0, 0));
String number = String.valueOf(r.nextInt(99999));
HttpSession session = request.getSession();
session.setAttribute("number", number);
g.drawString(number, 5, 15);
OutputStream os = response.getOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os);
encoder.encode(image);
}
}
希望对你有帮助
