What are Comments in JavaScript?

JavaScript supports both C-style and C++-style comments, thus

• Any text between a // and the end of a line is treated as a comment and is ignored by JavaScript.
• Any text between the characters /* and */ is treated as a comment. This may span multiple lines.
• JavaScript also recognizes the HTML comment opening sequence <!--. JavaScript treats this as a single-line comment, just as it does the // comment.
• The HTML comment closing sequence --> is not recognized by JavaScript so it should be written as //-->.

Example

The following example shows how to use comments in JavaScript.

<script>
   <!--
      // This is a comment. It is similar to comments in C++
         /*
            * This is a multiline comment in JavaScript
            * It is very similar to comments in C Programming
         */
   //-->
</script>