函数
code = "";
var codeLength =4;//验证码的长度
var selectChar = 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');//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显示样式，并显示
document.getElementById("discode").style.fontFamily="Fixedsys"; //设置字体
document.getElementById("discode").style.letterSpacing="5px"; //字体间距
document.getElementById("discode").style.color="#0ab000"; //字体颜色
document.getElementById("discode").innerHTML=code; // 显示
}
function but()
{//验证验证码输入是否正确
var val1=document.getElementById("t1").value;
var val2=code;
if(val1!=val2){
alert("验证码错误!");
document.getElementById('t1').value="";
}
}
验证码框
