问题描述
警告:我要听起来像我不知道我在说什么在这里,因为我有点不知道。我在自学Javascript和AngularJS通过大量的试验和错误编码。过程
Warning: I'm going to sound like I have no idea what I'm talking about here, because I kind of don't. I'm in the process of self-learning Javascript and AngularJS through a lot of trial and error coding.
我有一些javascript code(犹豫,因为它是一个烂摊子复制到这里)返回具有以下结构的对象:
I have some javascript code (hesitant to copy here because it's a mess) that returns an Object with the following structure:
我要保存到一个变量是对应于对象的对象。$$ state.value的图片。这个对象有用户名,哈希和盐,这是我所关心的。我不知道是什么都喜欢$$州其他的东西是或者他们是如何到达那里。
What I want to save to a variable is the object corresponding to Object.$$state.value in the picture. This object has username, hash and salt, which are what I care about. I don't know what all the other stuff like $$state are or how they got there.
但是,如果我这样做(让我们把主要的对象whatIHave):
However, if I do this (let's call the main Object "whatIHave"):
var whatIWant = whatIHave.$$state.value;
这是行不通的。 whatIWant为null。
this does not work. whatIWant is null.
有谁认识这是怎么回事呢?什么是$$状态,它是怎么到达那里,我怎么能提取我想要的价值?
Does anyone recognize what's going on here? What is $$state, how did it get there, and how can I extract the value I want?
推荐答案
所以这是一个承诺。你需要做的是这样的:
So that is a promise. You need to do something like:
whatIHave.then(function(whatIWant) {
// Work here
});
我强烈建议你研究一个承诺是什么(这样链接)
If you're curious enough, about what is that $$state
and what is that value
, I will explain a bit:
的承诺有一个 $$状态
有角可以节省你想在来调用待所有的回调函数
阵列(所有这些你。然后
注册功能就像我之前解释)。
It also have the status: resolved (1) and rejected (2)
您正试图在这里欺骗的,因为当你尝试访问值
,也可能是现在还没有(这就是异步
是所有)。
这样的想法是学习的承诺的基础上,学习如何与他们合作,然后用你的 whatIHave
正常。
这篇关于如何访问JSON对象。$$ state.value?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!