JavaScript Comments Using Comments


Example

To add annotations, hints, or exclude some code from being executed JavaScript provides two ways of commenting code lines

Single line Comment //

Everything after the // until the end of the line is excluded from execution.

function elementAt( event ) {
  // Gets the element from Event coordinates
  return document.elementFromPoint(event.clientX, event.clientY);
}
// TODO: write more cool stuff!

Multi-line Comment /**/

Everything between the opening /* and the closing */ is excluded from execution, even if the opening and closing are on different lines.

/*
   Gets the element from Event coordinates.
   Use like: 
   var clickedEl = someEl.addEventListener("click", elementAt, false);
*/
function elementAt( event ) {
  return document.elementFromPoint(event.clientX, event.clientY);
}
/* TODO: write more useful comments! */