直接上代码:
HTML:
<html>
<head>
<title>验证码基础</title>
<style type="text/css">
#code
{
font-family:Arial;
font-style:italic;
font-weight:bold;
border:0;
letter-spacing:2px;
color:blue;
}
</style>
<script type = "text/javascript" src = "yanzhen.js">
</script>
</head>
<body>
<div>
<input type = "text" id = "input"/>
<input type = "button" id="code" onclick="createCode()"/>
<input type = "button" value = "验证" onclick = "validate()"/>
</div>
</body> JS:(yanzhen.js)
var code ;
window.onload = function createCode(){
code = "";
var codeLength = 4;//验证码的长度 (可以任选的哦)
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++) {
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();
if(inputCode.length <= 0) {
alert("请输入验证码");
}
else if(inputCode != code ) {
alert("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("输入正确");
}
}
简单验证码生成与验证

本文介绍了一个简单的HTML和JavaScript实现的验证码生成与验证系统。该系统通过JavaScript随机生成由数字和字母组成的验证码,并将其显示在HTML页面上。用户在文本框中输入验证码后,点击验证按钮,系统将进行校验并给出反馈。
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