// 类库
var ajax = function (url, success, error) {
  ...
}

var items = [...];
var A = function (A, callback, error) {
   ....
   ajax("...", callback, error)
};


var i=1;
var next = function (callback) {
  if (i>=items.length) {
    throw "ERROR";
  } else {
    A(items[i++], callback, next);
  }
};

next(function () {
blahblah
});

【 在 Sunshow (忘了就好) 的大作中提到: 】
: function A(item, callback) {
:     //AJAX
: }
: ...................
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FROM 221.221.165.125