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How To Add Comments to Javascript

You can add comments to your javascript code that are not executed or displayed on your web pages.

Single line comments start with //.

Multiple line comments start with /* and end with */.

The javascript code below shows you how to add single line and multiple line comments to javascript code.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="https://www.w3.org/1999/xhtml" xml:lang="en">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />

<script type="text/javascript" language="javascript">

document.write("Hello World!");
// This is a single line comment
This is a multiple line comment
This is a multiple line comment



The javascript code above will display:

Hello World!