JavaScript random code generation and verification, for your reference, the specific contents are as follows
Since there are two ways to obtain event sources, they are attached here:
This is directly defined by var
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
< title > random verification code verification < / 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></div>
<input type="text" name="">
< input type = "button" name = "" value = "verify" >
<script type="text/javascript">
window.onload = function (){
var code;
// 1. Get the corresponding label
var codeDiv = document.getElementById("code");
var newCodeInput = document.getElementById("newCode");
var validate = document.getElementById("validate");
//Load the page to obtain the corresponding verification code
creatCode()
// 1. Get the integer 1 ~ 100 between min and max
function random(max,min){
return Math.floor(Math.random()*(max-min)+min);
}
function creatCode(){
code = "";
//Set length
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++){
//Set random range 36
var index = random(0,36);
code += randomCode[index];
}
codeDiv.innerHTML = code;
}
//Verification button verification
validate.onclick = function (){
//Get the verification code of the input user
var newCode = newCodeInput.value.toUpperCase();
if (newCode === code){
//Verify successful jump to the corresponding URL
window.location.href = "http://www.baidu.com";
}else {
//Validation failed
Alert ("verification failed, please re-enter")
//The input box is empty
newCodeInput.value = "";
//Retrieve verification code
creatCode();
}
}
}
</script>
</body>
</html>This variable is defined by function:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
< title > random verification code verification < / 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></div>
<input type="text" name="">
< input type = "button" name = "" value = "verify" >
<script type="text/javascript">
window.onload = function (){
var code;
// 1. Get the corresponding tag (get event source)
function $(id){
return typeof id === "string"?document.getElementById(id):null;
}
//Load the page to obtain the corresponding verification code
creatCode()
// 1. Get the integer 1 ~ 100 between min and max
function random(max,min){
return Math.floor(Math.random()*(max-min)+min);
}
function creatCode(){
code = "";
//Set length
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++){
//Set random range 36
var index = random(0,36);
code += randomCode[index];
}
$("code").innerHTML = code;
}
//Verification button verification
$("validate").onclick = function (){
//Get the verification code of the input user
var newCode = $("newCode").value.toUpperCase();
if (newCode === code){
//Verify successful jump to the corresponding URL
window.location.href = "http://www.baidu.com";
}else {
//Validation failed
Alert ("verification failed, please re-enter")
//The input box is empty
$("newCode").value = "";
//Retrieve verification code
creatCode();
}
}
}
</script>
</body>
</html>The two methods achieve the same effect. Attach renderings:
When you enter wrong data for verification, you will be prompted:
When entering the correct data for verification, click verify. If the verification is successful, it will jump to the specified path.
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