Hello, world!
This part of the tutorial is about core JavaScript, the language itself. But we need a working environment to run our scripts and, since this book is online, the browser is a good choice. We’ll keep the amount of browser-specific commands (like alert) to a minimum so that you don’t spend time on them if you plan to concentrate on another environment (like Node.js). We’ll focus on JavaScript in the browser in the next part of the tutorial. So first, let’s see how we attach a script to a webpage. For server-side environments (like Node.js), you can execute the script with a command like “node my.js”.
The “script” tag
JavaScript programs can be inserted almost anywhere into an HTML document using the
Summary
- We can use a . There is much more to learn about browser scripts and their interaction with the webpage. But let’s keep in mind that this part of the tutorial is devoted to the JavaScript language, so we shouldn’t distract ourselves with browser-specific implementations of it. We’ll be using the browser as a way to run JavaScript, which is very convenient for online reading, but only one of many.
<!DOCTYPE HTML>
<html>
<body>
<p>Before the script...</p>
*!*
<script>
alert( 'Hello, world!' );
</script>
*/!*
<p>...After the script.</p>
</body>
</html>
Follow the lesson from Microsoft Web-Dev-For-Beginners course