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("Empty Code!"
); //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("Error Code"
); //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("OK"
); //弹出^-^
}
}
