jQuery和链接

Question

Sometimes I need to use .off() before .on().

My Question is can I chain them both together or should they remain separate?

Can this:

   $('button').off('click');
    $('button;).on('click, function() {
    // code here.
    });

Become this and work the same:

$('button').off('click').on('click', function() {
 // code here
});

Will the .off() execute before the .on() in the chain.

I'm fairly new to chaining this is why I ask.

Answer 1

Yes, it will execute before the .on() method. Basically chaining allows you to write less amount of code and, btw, it fasters it a bit, cause you don't have to find your element multiple times in the DOM tree.(Each time you call $('#yourElmId') you basically call document.getElementById so if you call it twice - you will perform search of it two times and for big projects it's not great at all)

More details on jquery chaining here