Untitled

How to solve this JavaScript scope issue
var news;
$.get('news.txt', function (dat) {
   news = dat;
   if ($('#removeN').is(':checked')) {
       news = "";
   }
   alert(news) // Displaying exact result;
});
alert(news) // Displaying undefined..; Why?

var news;
$.get('news.txt', function (dat) {
   news = dat;
   if ($('#removeN').is(':checked')) {
       news = "";
   }
   alert(news) // BEFORE THIS!
});
alert(news) // THIS EXECUTES

$.get('news.txt', function (dat) {
   news = dat;
   if ($('#removeN').is(':checked')) {
       news = "";
   }
   doSomething(news) // Displaying exact result;
});

var doSomething = function(data) {
    alert(data);
}

var news;
$.get('news.txt', function (dat) {
   //process news
}).done(function(dat){
   //display news, or maybe more processing related to this particular function block
   alert(news);
}).fail(function(){
   //oops, something happened in attempting to get the news.
   alert("failed to get the news");
}).always(function(){
   //this eventually gets called regardless of outcome
});