JavaScript生成验证码并实现验证功能

Z时代
2024-01-10
分类：综合

废话不多说了，直接给大家贴代码了，具体代码如下所示：


<html> 
<head> 
<title>验证码</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 = "checkCode.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> 
</html>

checkCode.js


var code ; //在全局定义验证码 
//产生验证码 
window.onload = 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("^-^"); //弹出^-^ 
} 
}