javascript验证码,JavaScript验证码

使用JavaScript，如何生成汉字验证码？

简单代码如下：

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!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" ""

html xmlns=""

head

titleJS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 = 0; i codeLength; i++) {

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

javascript表单验证码怎么写

我来举个例子，很简单的

!DOCTYPE html

html

head

meta charset="UTF-8"

titleInsert title here/title

script type="text/javascript"

function formCheck(){//表单验证

var userForm=document.forms.userForm;

if(userForm.username.value==null||userForm.username.value.length=0){

alert("用户名不能为空");

return false;

}else if(userForm.username.value.length6||userForm.username.value.length20){

alert("用户名必须为6-20位");

return false;

}else if(userForm.password.value==null||userForm.password.value.length=0){

alert("密码不能为空");

return false;;

}else if(userForm.password.value.length6||userForm.password.value.length20){

alert("密码必须为6-20位");

return false;

}else{

userForm.submit();

}

}

/script

/head

body

form action="" name="userForm"

userName:input type="text" name="username"br

password:input type="password" name="password"br

input type="button" value="提交" onclick=" formCheck()"

/form

/body

/html

用JavaScript怎么设置验证码

我的开发工具是myeclipse复制以下代码,即可生成效果.

html xmlns=" "

head runat="server"

title无标题页/title

/head

body

form id="form1" runat="server"

div

div id="divCode" style="background-color:White; width:52px; height:16px; padding:5px; text-align:center; vertical-align:middle; letter-spacing:5px; border:solid 1px blue"span/spanspan /spanspan /spanspan /span/div

/div

input id="Button1" type="button" value="换一张" onclick="JavaScript:validteCode()"/

/form

/body

/html

script language="JavaScript" type="text/JavaScript"

function validteCode()

{

var codes = new Array(4); //用于存储随机验证码

var colors = new Array("Red","Green","Gray","Blue","Maroon","Aqua","Fuchsia","Lime","Olive","Silver");

for(var i=0;i codes.length;i++)

{//获取随机验证码

codes[i] = Math.floor(Math.random()*10);

}

var spans = document.getElementById("divCode").all;

for(var i=0;ispans.length;i++)

{

spans[i].innerHTML=codes[i];

spans[i].style.color = colors[Math.floor(Math.random()*10)]; //随机设置验证码颜色

}

}

document.onload = validteCode();

/script

怎样用JavaScript实现验证码的验证

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 = 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^-^

}

}