JS生成随机码：JavaScript实现随机码的生成与校验。
由于获取事件源有两种写法，所以在此处都附上：
这个是直接用var去定义的。
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>随机验证码校验</title>
<style type="text/css">
#code{
width: 100px;
height: 100px;
background-color: #ddd;
padding: 10px;
line-height: 100px;
text-align: center;
font-size: 20px;
color: red;
/*font-weight: bold;*/
}
</style>
</head>
<body>
<div id="code"></div>
<input type="text" name="" id="newCode">
<input type="button" name="" id="validate" value="验证">
<script type="text/javascript">
window.onload = function (){
var code;
// 1.获取对应的标签
var codeDiv = document.getElementById("code");
var newCodeInput = document.getElementById("newCode");
var validate = document.getElementById("validate");
// 加载页面获取对应验证码
creatCode()
// 1.获取min到max之间的整数 1~100
function random(max,min){
return Math.floor(Math.random()*(max-min)+min);
}
function creatCode(){
code = "";
// 设置长度
var codeLenth = 4;
var randomCode =[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"];
for(var i=0;i<codeLenth;i++){
// 设置随机范围36范围
var index = random(0,36);
code += randomCode[index];
}
codeDiv.innerHTML = code;
}
// 验证按钮校验
validate.onclick = function (){
// 获取输入用户的验证码
var newCode = newCodeInput.value.toUpperCase();
if (newCode === code){
// 验证成功 跳转对应的网址
window.location.href = "http://www.jiangweishan.com";
}else {
// 验证失败
alert("验证失败，请重新输入")
// 输入框置空
newCodeInput.value = "";
// 重新获取验证码
creatCode();
}
}
}
</script>
</body>
</html>这个是用function定义变量的：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>随机验证码校验</title>
<style type="text/css">
#code{
width: 100px;
height: 100px;
background-color: #ddd;
padding: 10px;
line-height: 100px;
text-align: center;
font-size: 20px;
color: red;
/*font-weight: bold;*/
}
</style>
</head>
<body>
<div id="code"></div>
<input type="text" name="" id="newCode">
<input type="button" name="" id="validate" value="验证">
<script type="text/javascript">
window.onload = function (){
var code;
// 1.获取对应的标签(获取事件源)
function $(id){
return typeof id === "string"?document.getElementById(id):null;
}
// 加载页面获取对应验证码
creatCode()
// 1.获取min到max之间的整数 1~100
function random(max,min){
return Math.floor(Math.random()*(max-min)+min);
}
function creatCode(){
code = "";
// 设置长度
var codeLenth = 4;
var randomCode =[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"];
for(var i=0;i<codeLenth;i++){
// 设置随机范围36范围
var index = random(0,36);
code += randomCode[index];
}
$("code").innerHTML = code;
}
// 验证按钮校验
$("validate").onclick = function (){
// 获取输入用户的验证码
var newCode = $("newCode").value.toUpperCase();
if (newCode === code){
// 验证成功 跳转对应的网址
window.location.href = "http://www.baidu.com";
}else {
// 验证失败
alert("验证失败，请重新输入")
// 输入框置空
$("newCode").value = "";
// 重新获取验证码
creatCode();
}
}
}
</script>
</body>
</html>试下吧。
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