Web Front-endJS TutorialJavascript method to verify Visa and MasterCard credit card numbers_javascript skillsJavascript method to verify Visa and MasterCard credit card numbers_javascript skills
本文实例讲述了Javascript验证Visa和MasterCard信用卡号的方法。分享给大家供大家参考。具体实现方法如下：
visa验证：
<HTML>
<head>
<title>Visa Example</title>
<script type="text/javascript">
function luhnCheckSum(sCardNum) {
var iOddSum = 0;
var iEvenSum = 0;
var bIsOdd = true;
for (var i=sCardNum.length-1; i >= 0; i--) {
var iNum = parseInt(sCardNum.charAt(i));
if (bIsOdd) {
iOddSum += iNum;
} else {
iNum = iNum * 2;
if (iNum > 9) {
iNum = eval(iNum.toString().split("").join("+"));
}
iEvenSum += iNum;
}
bIsOdd = !bIsOdd;
}
return ((iEvenSum + iOddSum) % 10 == 0);
}
function isValidVisa(sText) {
var reVisa = /^(4\d{12}(?:\d{3})?)$/;
if (reVisa.test(sText)) {
return luhnCheckSum(RegExp.$1);
} else {
return false;
}
}
function validate() {
var oInput1 = document.getElementById("txt1");
if (isValidVisa(oInput1.value)) {
alert("Valid");
} else {
alert("Invalid!");
}
}
</script>
</head>
<body>
<P>Visa Number: <input type="text" id="txt1" /><br />
<input type="button" value="Validate" onclick="validate()" /></p>
</body>
</html>
MasterCard验证：
<html>
<head>
<title>MasterCard Example</title>
<script type="text/javascript">
function luhnCheckSum(sCardNum) {
var iOddSum = 0;
var iEvenSum = 0;
var bIsOdd = true;
for (var i=sCardNum.length-1; i >= 0; i--) {
var iNum = parseInt(sCardNum.charAt(i));
if (bIsOdd) {
iOddSum += iNum;
} else {
iNum = iNum * 2;
if (iNum > 9) {
iNum = eval(iNum.toString().split("").join("+"));
}
iEvenSum += iNum;
}
bIsOdd = !bIsOdd;
}
return ((iEvenSum + iOddSum) % 10 == 0);
}
function isValidMasterCard(sText) {
var reMasterCard = /^(5[1-5]\d{2})[\s\-]?(\d{4})[\s\-]?(\d{4})[\s\-]?(\d{4})$/;
if (reMasterCard.test(sText)) {
var sCardNum = RegExp.$1 + RegExp.$2 + RegExp.$3 + RegExp.$4;
return luhnCheckSum(sCardNum);
} else {
return false;
}
}
function validate() {
var oInput1 = document.getElementById("txt1");
if (isValidMasterCard(oInput1.value)) {
alert("Valid");
} else {
alert("Invalid!");
}
}
</script>
</head>
<body>
<P>MasterCard Number: <input type="text" id="txt1" /><br />
<input type="button" value="Validate" onclick="validate()" /></p>
</body>
</html>
希望本文所述对大家的javascript程序设计有所帮助。
Beyond the Browser: JavaScript in the Real WorldApr 12, 2025 am 12:06 AMJavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.
Building a Multi-Tenant SaaS Application with Next.js (Backend Integration)Apr 11, 2025 am 08:23 AMI built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing
How to Build a Multi-Tenant SaaS Application with Next.js (Frontend Integration)Apr 11, 2025 am 08:22 AMThis article demonstrates frontend integration with a backend secured by Permit, building a functional EdTech SaaS application using Next.js. The frontend fetches user permissions to control UI visibility and ensures API requests adhere to role-base
JavaScript: Exploring the Versatility of a Web LanguageApr 11, 2025 am 12:01 AMJavaScript is the core language of modern web development and is widely used for its diversity and flexibility. 1) Front-end development: build dynamic web pages and single-page applications through DOM operations and modern frameworks (such as React, Vue.js, Angular). 2) Server-side development: Node.js uses a non-blocking I/O model to handle high concurrency and real-time applications. 3) Mobile and desktop application development: cross-platform development is realized through ReactNative and Electron to improve development efficiency.
The Evolution of JavaScript: Current Trends and Future ProspectsApr 10, 2025 am 09:33 AMThe latest trends in JavaScript include the rise of TypeScript, the popularity of modern frameworks and libraries, and the application of WebAssembly. Future prospects cover more powerful type systems, the development of server-side JavaScript, the expansion of artificial intelligence and machine learning, and the potential of IoT and edge computing.
Demystifying JavaScript: What It Does and Why It MattersApr 09, 2025 am 12:07 AMJavaScript is the cornerstone of modern web development, and its main functions include event-driven programming, dynamic content generation and asynchronous programming. 1) Event-driven programming allows web pages to change dynamically according to user operations. 2) Dynamic content generation allows page content to be adjusted according to conditions. 3) Asynchronous programming ensures that the user interface is not blocked. JavaScript is widely used in web interaction, single-page application and server-side development, greatly improving the flexibility of user experience and cross-platform development.
Is Python or JavaScript better?Apr 06, 2025 am 12:14 AMPython is more suitable for data science and machine learning, while JavaScript is more suitable for front-end and full-stack development. 1. Python is known for its concise syntax and rich library ecosystem, and is suitable for data analysis and web development. 2. JavaScript is the core of front-end development. Node.js supports server-side programming and is suitable for full-stack development.
How do I install JavaScript?Apr 05, 2025 am 12:16 AMJavaScript does not require installation because it is already built into modern browsers. You just need a text editor and a browser to get started. 1) In the browser environment, run it by embedding the HTML file through tags. 2) In the Node.js environment, after downloading and installing Node.js, run the JavaScript file through the command line.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
Notepad++7.3.1
Easy-to-use and free code editor
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
