<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>JS生成验证码</title>
<style type="text/css">
.code {
background-image: url(code.jpg)
font-family: Arial
font-style: italic
color: Red
border: 0
padding: 2px 3px
letter-spacing: 3px
font-weight: bolder
}
.unchanged {
border: 0
}
</style>
<script language="javascript" type="text/javascript">
var code//在全局 定义验证码
function createCode() {
code = ""
var codeLength = 6//验证码的长度
var checkCode = document.getElementById("checkCode")
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 = 0i <codeLengthi++) {
var charIndex = Math.floor(Math.random() * 36)
code += selectChar[charIndex]
}
//alert(code)
if (checkCode) {
checkCode.className = "code"
checkCode.value = code
}
}
function validate() {
var inputCode = document.getElementById("input1").value
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
} else {
alert("^-^ OK")
}
}
</script>
</head>
<body onload="createCode()">
<form action="#">
<input type="text" id="input1" /><input type="text" onclick="createCode()" readonly="readonly" id="checkCode" class="unchanged" style="width: 80px" /><br />
<input id="Button1" onclick="validate()" type="button" value="确定" />
</form>
</body>
</html>
注意别用在实际生产项目中
/***************************************************//**效果倒是出来了,但是不是十分好看*********/
/**建议还是单选汉字或者去掉汉字看看*******/
/**************************************************/
<html>
<head>
<style type="text/css">
.code{
background-image:url(code.jpg)
font-family:Arial
font-style:italic
color:Red
border:0
padding:2px 3px
letter-spacing:3px
font-weight:bolder
}
.unchanged {
border:0
}
</style>
<script language="javascript" type="text/javascript">
var code //在全局 定义验证码
function createCode(){
code = ""
var codeLength = 100//验证码的长度
var checkCode = document.getElementById("checkCode")
checkCode.value = ""
var selectChar = new Array(2,3,4,5,6,7,8,9,'A','B','C','D','E','F','G','H','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z','\u7684','\u4e00','\u4e86','\u662f','\u6211','\u4e0d','\u5728','\u4eba','\u4eec','\u6709','\u6765','\u4ed6','\u8fd9','\u4e0a','\u7740','\u4e2a','\u5730','\u5230','\u5927','\u91cc','\u8bf4','\u5c31','\u53bb','\u5b50','\u5f97','\u4e5f','\u548c','\u90a3','\u8981','\u4e0b','\u770b','\u5929','\u65f6','\u8fc7','\u51fa','\u5c0f','\u4e48','\u8d77','\u4f60','\u90fd','\u628a','\u597d','\u8fd8','\u591a','\u6ca1','\u4e3a','\u53c8','\u53ef','\u5bb6','\u5b66','\u53ea','\u4ee5','\u4e3b','\u4f1a','\u6837','\u5e74','\u60f3','\u751f','\u540c','\u8001','\u4e2d','\u5341','\u4ece','\u81ea','\u9762','\u524d','\u5934','\u9053','\u5b83','\u540e','\u7136','\u8d70','\u5f88','\u50cf','\u89c1','\u4e24','\u7528','\u5979','\u56fd','\u52a8','\u8fdb','\u6210','\u56de','\u4ec0','\u8fb9','\u4f5c','\u5bf9','\u5f00','\u800c','\u5df1','\u4e9b','\u73b0','\u5c71','\u6c11','\u5019','\u7ecf','\u53d1','\u5de5','\u5411','\u4e8b','\u547d','\u7ed9','\u957f','\u6c34','\u51e0','\u4e49','\u4e09','\u58f0','\u4e8e','\u9ad8','\u624b','\u77e5','\u7406','\u773c','\u5fd7','\u70b9','\u5fc3','\u6218','\u4e8c','\u95ee','\u4f46','\u8eab','\u65b9','\u5b9e','\u5403','\u505a','\u53eb','\u5f53','\u4f4f','\u542c','\u9769','\u6253','\u5462','\u771f','\u5168','\u624d','\u56db','\u5df2','\u6240','\u654c','\u4e4b','\u6700','\u5149','\u4ea7','\u60c5','\u8def','\u5206','\u603b','\u6761','\u767d','\u8bdd','\u4e1c','\u5e2d','\u6b21','\u4eb2','\u5982','\u88ab','\u82b1','\u53e3','\u653e','\u513f','\u5e38','\u6c14','\u4e94','\u7b2c','\u4f7f','\u5199','\u519b','\u5427','\u6587','\u8fd0','\u518d','\u679c','\u600e','\u5b9a','\u8bb8','\u5feb','\u660e','\u884c','\u56e0','\u522b','\u98de','\u5916','\u6811','\u7269','\u6d3b','\u90e8','\u95e8','\u65e0','\u5f80','\u8239','\u671b','\u65b0','\u5e26','\u961f','\u5148','\u529b','\u5b8c','\u5374','\u7ad9','\u4ee3','\u5458','\u673a','\u66f4','\u4e5d','\u60a8','\u6bcf','\u98ce','\u7ea7','\u8ddf','\u7b11','\u554a','\u5b69','\u4e07','\u5c11','\u76f4','\u610f','\u591c','\u6bd4','\u9636','\u8fde','\u8f66','\u91cd','\u4fbf','\u6597','\u9a6c','\u54ea','\u5316','\u592a','\u6307','\u53d8','\u793e','\u4f3c','\u58eb','\u8005','\u5e72','\u77f3','\u6ee1','\u65e5','\u51b3','\u767e','\u539f','\u62ff','\u7fa4','\u7a76','\u5404','\u516d','\u672c','\u601d','\u89e3','\u7acb','\u6cb3','\u6751','\u516b','\u96be','\u65e9','\u8bba','\u5417','\u6839','\u5171','\u8ba9','\u76f8','\u7814','\u4eca','\u5176','\u4e66','\u5750','\u63a5','\u5e94','\u5173','\u4fe1','\u89c9','\u6b65','\u53cd','\u5904','\u8bb0','\u5c06','\u5343','\u627e','\u4e89','\u9886','\u6216','\u5e08','\u7ed3','\u5757','\u8dd1','\u8c01','\u8349','\u8d8a','\u5b57','\u52a0','\u811a','\u7d27','\u7231','\u7b49','\u4e60','\u9635','\u6015','\u6708','\u9752','\u534a','\u706b','\u6cd5','\u9898','\u5efa','\u8d76','\u4f4d','\u5531','\u6d77','\u4e03','\u5973','\u4efb','\u4ef6','\u611f','\u51c6','\u5f20','\u56e2','\u5c4b','\u79bb','\u8272','\u8138','\u7247','\u79d1','\u5012','\u775b','\u5229','\u4e16','\u521a','\u4e14','\u7531','\u9001','\u5207','\u661f','\u5bfc','\u665a','\u8868','\u591f','\u6574','\u8ba4','\u54cd','\u96ea','\u6d41','\u672a','\u573a','\u8be5','\u5e76','\u5e95','\u6df1','\u523b','\u5e73','\u4f1f','\u5fd9','\u63d0','\u786e','\u8fd1','\u4eae','\u8f7b','\u8bb2','\u519c','\u53e4','\u9ed1','\u544a','\u754c','\u62c9','\u540d','\u5440','\u571f','\u6e05','\u9633','\u7167','\u529e','\u53f2','\u6539','\u5386','\u8f6c','\u753b','\u9020','\u5634','\u6b64','\u6cbb','\u5317','\u5fc5','\u670d','\u96e8','\u7a7f','\u5185','\u8bc6','\u9a8c','\u4f20','\u4e1a','\u83dc','\u722c','\u7761','\u5174','\u5f62','\u91cf','\u54b1','\u89c2','\u82e6','\u4f53','\u4f17','\u901a','\u51b2','\u5408','\u7834','\u53cb','\u5ea6','\u672f','\u996d','\u516c','\u65c1','\u623f','\u6781','\u5357','\u67aa','\u8bfb','\u6c99','\u5c81','\u7ebf','\u91ce','\u575a','\u7a7a','\u6536','\u7b97','\u81f3','\u653f','\u57ce','\u52b3','\u843d','\u94b1','\u7279','\u56f4','\u5f1f','\u80dc','\u6559','\u70ed','\u5c55','\u5305','\u6b4c','\u7c7b','\u6e10','\u5f3a','\u6570','\u4e61','\u547c','\u6027','\u97f3','\u7b54','\u54e5','\u9645','\u65e7','\u795e','\u5ea7','\u7ae0','\u5e2e','\u5566','\u53d7','\u7cfb','\u4ee4','\u8df3','\u975e','\u4f55','\u725b','\u53d6','\u5165','\u5cb8','\u6562','\u6389','\u5ffd','\u79cd','\u88c5','\u9876','\u6025','\u6797','\u505c','\u606f','\u53e5','\u533a','\u8863','\u822c','\u62a5','\u53f6','\u538b','\u6162','\u53d4','\u80cc','\u7ec6')
for(var i=0i<codeLengthi++) {
var charIndex = Math.floor(Math.random()*550)
code +=selectChar[charIndex]
}
if(code.length != codeLength){
createCode()
}
checkCode.value = code
}
function validate () {
var inputCode = document.getElementById("input1").value.toUpperCase()
if(inputCode.length <=0) {
alert("请输入验证码！")
return false
}
else if(inputCode != code ){
alert("验证码输入错误！")
createCode()
return false
}
else {
alert("OK")
return true
}
}
</script>
</head>
<body onload="createCode()">
<input type="text" id="input1" />
<input type="text" id="checkCode" class="code" style="width: 1000px" /><a href="#" onclick="createCode()">看不清楚</a><input id="Button1" onclick="validate()" type="button" value="确定" />
<script></script>
</body>
</html>
用JavaScript实现验证码的验证主要代码如下：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 = 0i <codeLengthi++) {//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^-^
}
}
