使用延迟到多个ajax调用的链循环

There are multiple questions that already have an answer about this, but all aren't working so far it this kind of setup.

有很多问题已经对此有了答案,但到目前为止所有这些都没有用到这种设置。

function login(u,p) {
   console.log(1);
   return $.post(url, {u,p});
}

function out() {
   console.log(3);
   //a function that does not return deferred
   // clear cookies
}

function doSomething() {
  console.log(2);
  // a function that returns a deferred
  return $.post(...);
}
var data = [{u: 'au', p: 'ap'}, {u: 'bu', p: 'bp'}]

$.each(data, function(k,v){
  login(v.u, v.p).then(doSomething).then(out);
});

I was expecting it's sequence to be like:

我期待它的顺序如下:

But I get

但我明白了

Why is it like that, even though I am waiting for the promise to be resolve using then

为什么会这样,即使我在等待使用当时的解决方案

2 个解决方案

#1

If you want the logins to run synchronously:

如果您希望登录同步运行:

var p = new jQuery.Deferred();
$.each(data, function(k,v){
  p.then(function() {
    return login(v.u, v.p);
  }).then(doSomething).then(out);
});

Each new item iterated over in $.each won't trigger a new response until p finishes the last one.

在$ .each中迭代的每个新项目都不会触发新的响应,直到p完成最后一个。

2 个解决方案

#1

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