Examples of Closure

from jquery ninja book

HTML

<ul id="results"></ul>

CSS

#results li.pass { color: green; }
#results li.fail { color: red; }

JavaScript

var add = ( function()
{
var counter = 0;

return function 
()

{
 counter +=1;
 return counter;

}

})
();

function myFunction()
{
documnet.getElementByID("Demo").innerHTML = add();
}