如何链Ajax请求？

问题描述

我要与强迫我请求链条远程API进行交互。那是一个回调地狱异步模式：

I have to interact with a remote api that forces me to chain requests. Thats a callback-hell in asynchronous mode:

// pseudocode: ajax(request_object, callback)
ajax(a, function() {
  ajax(b(a.somedata), function() {
    ajax(c(b.somedata), function() {
      c.finish()
    }
  })
})

这将是多大的同步模式更具可读性：

It would be much more readable in sync mode:

sjax(a)
sjax(b(a.somedata))
sjax(c(b.somedata))
c.finish()

不过的 Sjax 的是邪恶的:)我怎么做，在一个不那么邪恶和可读的方式？

But Sjax is evil :) How do I do that in a not-so-evil and readable way?

推荐答案

不要使用匿名函数。给他们的名字。我不知道你是否能做到什么，我下面写的，但：

Don't use anonymous functions. Give them names. I don't know if you're able to do what I wrote below though:

var step_3 = function() {
    c.finish();
};

var step_2 = function(c, b) {
    ajax(c(b.somedata), step_3);
};

var step_1 = function(b, a) {
  ajax(b(a.somedata), step_2);
};

ajax(a, step_1);

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