JavaScript Tutorial - Hello World
In this tutorial, we’re going to do a simple Hello World program in JavaScript as the starting point of our JavaScript tutorial.
JavaScript Hello World
<!DOCTYPE HTML>
<html>
<body>
<p>JavaScript Tutorial</p>
<script>
alert( 'Hello, world!' );
</script>
</body>
</html>
<script>
alert( 'Hello, world!' );
</script>
When we embed JavaScript in a web page, we always have to embed it within the script tags <script>...</script>.
alert('Hello, world!');
It is simply an alert with information Hello World! within the parenthesis, and then it ends with a semicolon.
If you save the above code to a file named like helloworld.html and then view it in a browser, you will get a pop-up box saying Hello world!.
Basic JavaScript Syntax Rules
Before we continue to learn JavaScript further, we should get some basic syntax rules of this scripting language.
- JavaScript is case sensitive. It is valid for both variables and functions.
- Each statement ends with a semicolon.
Founder of DelftStack.com. Jinku has worked in the robotics and automotive industries for over 8 years. He sharpened his coding skills when he needed to do the automatic testing, data collection from remote servers and report creation from the endurance test. He is from an electrical/electronics engineering background but has expanded his interest to embedded electronics, embedded programming and front-/back-end programming.
LinkedIn Facebook