a comment is used for understanding JavaScript code. you can place comments in code that are not executed as part of the program.
there are two ways, you can declare a comment in JavaScript single-line comment and multi-line comment.
Any line starting with a double slash \\ is Single-Line comments. for example
// javascript program to print 1 to 10
for(i=1;i<=10;i++)
{
document.writeln(i);
}Here, // javascript program to print 1 to 10 is a comment
In JavaScript, multi-line comments start with /* and end with */
Any text between /* and */ is a multi-line comment. For example,
/* it will print 1 to 10
for loop start with 1 and end with 10
and increment by 1 */
for(i=1;i<=10;i++)
{
document.writeln(i);
}