JavaScript Comments

JavaScript Comments

Comments can be added to explain the JavaScript, or to make the code more readable.

Single line comments start with //.

The following example uses single line comments to explain the code:

Example

<script type="text/javascript">

// Write a heading

document.write("<h1>This is a heading</h1>");

// Write two paragraphs:

document.write("<p>This is a paragraph.</p>");

document.write("<p>This is another paragraph.</p>");

</script>

JavaScript Multi-Line Comments

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

The following example uses a multi line comment to explain the code:

Example

<script type="text/javascript">

/*

The code below will write

one heading and two paragraphs

*/

document.write("<h1>This is a heading</h1>");

document.write("<p>This is a paragraph.</p>");

document.write("<p>This is another paragraph.</p>");

</script>

Using Comments at the End of a Line

In the following example the comment is placed at the end of a code line:

Example

<script type="text/javascript">

document.write("Hello"); // Write "Hello"

document.write(" Dolly!"); // Write " Dolly!"

</script>

Posted in: JS COMMENTS