- JavaScript is one of the most popular programming languages in the web development world and is also called a scripting language.
- JavaScript can be used to change the HTML elements.
- JavaScript uses DOM(Document Object Model) which is a standard for accessing the HTML elements.
- JavaScript can be used to change the style of HTML elements.
- JavaScript is often used to validate the input fields of HTML forms, meaning to perform client-side validations.
JavaScript in <script>
- Syntactically JavaScript must be inserted between the tags
- <script> ... </script>
- <script> means start of JavaScript code.
- </script> means end of JavaScript code.
JavaScript in <head> and <body>
- JavaScript code can be used in either <head> and <body> elements or in both.
- We can use <script> any number of times in a HTML page.
- Good Practice : Separating HTML and JavaScript and putting all JS code in one place is always a good habit.
- Normally, JavaScript is used to execute upon an event in a HTML page like a Button press.
JavaScript as External File
- JavaScript apart from HTML file can also be placed in a separate file, t
he extension of such file would be ".js".
syntax : <script src = "myscript.js"></script>
