What is console.log?

Mihir picture Mihir · Dec 27, 2010 · Viewed 730.3k times · Source

What is the use of console.log?

Please explain how to use it in JavaScript, with a code example.

Answer

Jan Hančič picture Jan Hančič · Dec 27, 2010

It's not a jQuery feature but a feature for debugging purposes. You can for instance log something to the console when something happens. For instance:

$('#someButton').click(function() {
  console.log('#someButton was clicked');
  // do something
});

You'd then see #someButton was clicked in Firebug’s “Console” tab (or another tool’s console — e.g. Chrome’s Web Inspector) when you would click the button.

For some reasons, the console object could be unavailable. Then you could check if it is - this is useful as you don't have to remove your debugging code when you deploy to production:

if (window.console && window.console.log) {
  // console is available
}