In JavaScript code you can explain the JavaScript code step by step by adding comments along with. You can write comment lines to explain about the variable, that why you are declaring the variable what value will it store in further coding. You can explain about the loops or logic you are using for scripting any part of the code.
If there is any code, you don’t want to use at one time but will consider it later then you can make it a comment. This commented code or other documentation done within comments will not execute at any time.
Single line Comments
You can use // for single line comments.
Multi line Comments
You can comment multiple lines JavaScript comment by using /* as starting and */ as the end of comment lines.
Example of Single line Comments
<script language="javascript" type="text/javascript">
// Header part
document.write("<h1>Header</h1>");
// paragraph number 1 starts here
document.write("<p>1st paragraph lines here</p>");
// paragraph 2 starts here
document.write("<p>2nd paragraph lines here</p>");
</script>
Example of Multiple lines Comments
<script language="javascript" type="text/javascript">
/*
document.write("<h1>Header</h1>");
document.write("<p>1st paragraph lines here</p>");
document.write("<p>2nd paragraph lines here</p>");
*/
</script>
The above code inside the /* */ will not be executed.
