<script type="text/javascript" src="jquery.js"></script>
 <script type="text/javascript">
   // we will add our javascript code here
   <!-- we will add our HTML content here -->

  <a href="">Link</a>


As almost everything we do when using jQuery reads or manipulates the document object model (DOM), we need to make sure that we start adding events etc. as soon as the DOM is ready.

 $(document).ready(function() {
   $("a").click(function() {
     alert("Hello world!");

$("a") is a jQuery selector, in this case, it selects all a elements. $ itself is an alias for the jQuery "class", therefore $() constructs a new jQuery object. The click() function we call next is a method of the jQuery object. It binds a click event to all selected elements (in this case, a single anchor element) and executes the provided function when the event occurs.

This is similar to the following code:

  <a href="" onclick="alert('Hello world')">Link</a>

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