Edit in JSFiddle

//the click method takes a callback that gets called when the button is clicked

$("#exeBtn").click(function(){
    var poorVariable = "Alas woe as me for I only live in the scope of this click callback";
    alert(poorVariable);
});


/*
When you look at your debugger you will see something like
Uncaught ReferenceError: poorVariable is not defined 
when we make our console.info(poorVariable) call 
because the poorVariable is no longer with us at this point :( poor poor poorVariable
*/
console.info(poorVariable);

<div id="contentDumper"></div>
<input type="button" id="exeBtn" value="click me" />