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How could I add a Javascript Alert to a buy now Payal button.
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How could I add a Javascript Alert to a buy now Payal button.

How Can I add a Javascript alert to a buy now paypal button?

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.

JavaScript

Electronic commerce (e-commerce) is the trading in products or services using computer networks, such as the Internet. E-commerce draws on technologies such as mobile commerce, electronic funds transfer (EFT), supply chain management, online transaction processing, electronic data interchange (EDI), inventory management systems, and automated data collection systems. Use this topic to discuss online shopping carts, online marketplaces, and e-commerce platforms.

E-Commerce

Web applications are systems that run in browsers that perform functions normally associated with other client-based programs. One of the most commonly used web applications is email; instead of downloading individual emails to a local machine, the data is shown through a website. Other examples of web applications are collaborative systems like a wiki or an online game.

Web Applications

HTML (HyperText Markup Language) is the main markup language for creating web pages and other information to be displayed in a web browser, providing both the structure and content for what is sent from a web server through the use of tags. The current implementation of the HTML specification is HTML5.

HTML

PayPal's services allow people to make financial transactions online by granting the ability to transfer funds electronically between individuals and businesses. Through PayPal, users can send or receive payments for online auctions on websites like eBay, purchase or sell goods and services, or donate money or receive donations. The company operates as an acquirer, performing payment processing for online vendors, auction sites and other commercial users, for which it charges a fee.