验证码：
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<
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()'
>
<
div
>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()"
/>
</
div
>
</
body
>
</
html
>
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