Angular JS $ http.success()vs $ q.resolve()? [英] Angular JS $http.success() vs $q.resolve()?
问题描述
我试图找出承诺...简单地制作一个$ http请求,然后根据是否成功(.success())&它失败了(.fail()),与使用q.resolve()的promise(q = $ q.defer())相比?
I am trying to figure out promises... What is the difference between simply making an $http request, then acting upon whether is what successful (.success()) & it failing (.fail()), in comparison to a promise (q = $q.defer()) with q.resolve()?
推荐答案
$ http
本身使用 $ q
。这两种服务都没有在同一级别运行。
$http
itself uses $q
. These both services are not operating at the same level.
$ http.get(url)
返回一个承诺可以解决或拒绝。这意味着您正在使用服务提供的承诺($ http)。在内部, $ http
将调用 $ q.defer()
,然后 $ q.resolve ()
或 $ q.reject()
。这将调用您的 .success()
或 .fail()
方法。
$http.get(url)
returns a promise that can be resolved or rejected. It means that you are using a promise delivered by a service ($http). Internally, $http
will call $q.defer()
, then $q.resolve()
or $q.reject()
. This will call either your .success()
or .fail()
method.
$ q
是一项创建自己承诺的服务。
$q
is a service to create your own promise.
使用 $ q
是了解承诺的好方法,但在您的情况下, $ http
已经为您完成了这项工作。
Using $q
is a great way to learn about promises but in your case, $http
is already doing that work for you.
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