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>