仅显示前 X 个 Div，切换其余

var news = 2;
hidenews = "- Hide news archive";
shownews = "+ Show news archive";

$(".archive").html( shownews );
$(".news:not(:lt("+news+"))").hide();

$(".archive").click(function (e) {
   e.preventDefault();
       if ($(".news:eq("+news+")").is(":hidden")) {
           $(".news:hidden").show();
           $(".archive").html( hidenews );
       } else {
           $(".news:not(:lt("+news+"))").hide();
           $(".archive").html( shownews );
       }
});

HTML

<div class="news">First news</div>
<div class="news">Second news</div>
<div class="news">Third news</div>
<a class="archive" href="#"></a>