jquery Dollar sign

i have this html:

<ul id="list1" class="eventlist">
  <li>plain</li>
  <li class="special">special <button>I am special</button></li>
  <li>plain</li>
</ul>

and I have this jquery code:

$('#list1 li.special button').click(function(开发者_如何学编程event) {

  var $newLi = $('<li class="special"><button>I am new</button></li>');
  var $tgt = $(event.target);
});

My question is what is the difference between

var $tgt = $(event.target);

and

var $tgt = event.target;

event.target is a reference to the DOM node. $(event.target) is a jQuery object that wraps the DOM node, which lets you use jQuery's magic to query manipulate the DOM.

In other words, you can do this:

$(event.target).addClass('myClass');

but you can't do this:

event.tagert.addClass('myClass');

In the first case, the local varialbe $tgt will hold the jQuery element (wrapped around a DOM element), in the second case it will hold the DOM element.

You cannot use the jQuery manipulation methods (such as .val()) directly on DOM elements, hence you need to convert it to a jQuery element first if you want to do so.

I'd advise just using $(this) to grab the element. jQuery does that internally so you don't have to:

$('#list1 li.special button').click(function() {
    var $tgt = $(this);
});

To answer your question: $(event.target) will be extended with jQuery, and event.target won't.