JavaScript Comments

The programming design is explained in JavaScript comments. If required, they can also be used to prohibit the execution of a part of code. While the compiler is running the code, comments are ignored. Comments are user-friendly because they allow users to acquire code explanations.

Return Value: Comments are ignored during code execution.

You can use comments to add notes or hints to JavaScript code. The JavaScript engine ignores the comments when executing the code.

JavaScript allows for both single-line and block comments.

Single-Line Comments

A single-line remark begins with two forward slashes (/). A single-line comment converts all text after the / on the same line into a comment.

Example

<!DOCTYPE html>
<html>
<body>

<h1 id="wc"></h1>
<p id="wt"></p>

<script>
document.getElementById("wc").innerHTML = "Welcome";

// A single line comment
//document.getElementById("wt").innerHTML = "Webtutor.dev";
</script>

</body>
</html>

Preview

Block Comments

A delimited comment starts with a forward slash and an asterisk /* and ends with the opposite */.

Example

<!DOCTYPE html>
<html>
<body>

<h1 id="wc"></h1>
<p id="wt"></p>

<script>
/* A Multi line comment
document.getElementById("wc").innerHTML = "Welcome"; */

document.getElementById("wt").innerHTML = "Webtutor.dev";
</script>

</body>
</html>

Preview

JS Syntax

JS Variables

JavaScript Comments

Single-Line Comments

Example

Block Comments

Example

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