返回的承诺， $。阿贾克斯内部返回。

Return the promise that $.ajax returns internally.

function loadPosts(skip, take, container) {
   return $.ajax({ /* options left out for brevity */})
}

然后可以使用一审承诺回调初始化第二个

Can then use promise callback of first instance to initialize second

loadPosts(skip, take, $postContainer).done(function(){
    loadPosts(0, 10, $recentPostContainer);
});