JavaScript Where To
In HTML, You can write JavaScript code between script tag or into separate .js file to execute JavaScript code.
The <script> Tag
In HTML, JavaScript code is inserted between <script> and </script> tags.
Example :
<script> document.getElementById("demo").innerHTML = "Hello World"; </script>
JavaScript in <head> Tag
JavaScript code can be placed in the <head> section of an HTML page.
Example :
<!DOCTYPE html> <html> <head> <script> function myFunction() { document.getElementById("demo").innerHTML = "Hello World."; } </script> </head> <body> <h2>Demo JavaScript in Head</h2> <p id="demo"></p> <button type="button" onclick="myFunction()">Try it</button> </body> </html>
JavaScript in <body> Tag
JavaScript code can be placed in the <body> section of an HTML page.
Example:
<!DOCTYPE html> <html> <body> <h2>JavaScript in Body</h2> <p id="demo"></p> <button type="button" onclick="myFunction()">Try it</button> <script> function myFunction() { document.getElementById("demo").innerHTML = "Hello World."; } </script> </body> </html>
External JavaScript
Scripts can also be placed in external files:
script.js external file:
function myFunction() { document.getElementById("demo").innerHTML = "Hello World."; }
To use an external script, put the name of the script file in the src attribute of a <script> tag:
How to include external js file:
<script src="script.js"></script>
