Download the jQuery-1.11.0.js file form http://jquery.com/download/
Add the jQuery-1.11.0.js to the Solution Explorer and drag and drop the jquery-1.11.0.js file from the Solution Explorer onto your default.aspx page as shown below.
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To display an alert on a Button click using jQuery, add a Button element to the page as shown below:
<asp:Button ID="Button1" runat="server" Text="Button" />
Now add a 
script tag to add some 
jQuery function as in the following block:
<script type="text/javascript">
$(document).ready(function() {
// add code here
});
</script>
Add your code to the function block:
<script type="text/javascript">
   $(document).ready(function() {
   $("#Button1").click(function() {
      alert("Hello world!");
   });
   });
</script>
On clicking the button, you get an alert code similar to the following:
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To do some animation on button click using 
jQuery, add 
a HTML button and 
a <asp
:Panel> to the page as shown below:
<form id="form1" runat="server">
   <input id="btnAnimate" type="button" value="Animate" />
   <asp:Panel ID="Panel1" runat="server">
      Some sample text in this panel
   </asp:Panel>
</form>
Also add some 
CSS to design the 
div. The <style> tag has been kept 
in the <head> of the default.aspx page.
<style type="text/css">
   div {
      background-color:#D5EDEF;
      color:#4f6b72;
      width:50px;
      border: 1px solid #C1DAD7;
   }
</style>
Finally add the 
jQuery code to animate the panel on button click as in the following:
<script type="text/javascript">
   $(document).ready(function() {
      $("#btnAnimate").click(function() {
         $("#Panel1").animate(
         {
            width: "350px",
            opacity: 0.5,
            fontSize: "16px"
         }, 1800);
      });
   });
</script>
Run the sample and see the Panel being animated as shown below.
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