AMD加载器如何在引擎盖下工作？ [英] How do AMD loaders work under the hood?
问题描述
所以我现在一直在使用require.js，但我意识到我实际上并不知道它是如何工作的。它说这是一个AMD加载器。
So I've been using require.js for while now, but I realized that I actually don't know how it works under the hood. It says that it's an AMD loader.
我知道CommonJS是同步的，这意味着它在加载时会阻止其他代码的执行。另一方面，AMD是异步的。这就是我感到困惑的地方。
I do understand that CommonJS is synchronous, which means that it blocks execution of other codes while it's being loaded. On the other hand, AMD is asynchronous. This is where I get confused.
当我定义一个模块时，它必须加载a，b，c才能执行回调。异步如何在这里工作？
When I define a module, it has to load a,b,c in order to execute the callback. How does asynchronous work here?
- 当它必须首先加载这三个依赖项时，它不是同步的吗？
- 是吗？意味着AMD异步加载a，b，c然后检查是否加载了这些文件（不关心顺序）然后执行回调？
define("name",["a","b","c"], function(a,b,c){
});
推荐答案
如您所知，AMD（异步模块定义） （AMD））是一个特定的API。有许多与AMD兼容的加载器，包括RequireJS，curl.js和Dojo（以及其他）。
As you know, "AMD" (Asynchronous Module Definition (AMD)) is a specific API. There are many AMD-compatible "loaders", including RequireJS, curl.js and Dojo (among others).
就像JQuery和Dojo这样的框架为你提供API原始Javascript;使用AMD的程序：
Just as frameworks like JQuery and Dojo give you an API over raw Javascript; a program that uses AMD:
1）要求你提供与AMD兼容的.js库，
1) requires you an AMD-compatible .js library,
2）需要某些编程规则和约定，并且
2) demands certain programming "rules" and "conventions", and
3）最终位于Javascript的顶部，它运行在你的Javascript引擎上（不管是IE吗？ ，Chrome，Firefox - 无论如何）。
3) Ultimately sits "on top" of Javascript, which runs on your "Javascript engine" (be it IE, Chrome, Firefox - whatever).
以下是我发现有用的几个链接：
Here are a couple of links I found useful:
http://dojotoolkit.org/reference-guide /1.8/loader/amd.html
http://blog.millermedeiros.com/amd-is-better-for-the-web-than-commonjs-modules/
http://addyosmani.com/writing-modular-js /
PS：
要回答您的直接问题，后一个链接有点讨论require（）和dynamic_loaded依赖。
PS: To answer your immediate question, the latter link has a bit of discussion about "require()" and "dynamically_loaded dependencies".
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