blocks|key|4616292|text|此函数返回内部模块，如require。它不是公共的，所以你不应该在你的代码中依赖它，但是如果你想了解它是如何工作的，你可以用它来处理节点的底层对象。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4616293|例如，注册here+timer_wrap绑定。It+exports+Timer构造函数。在lib/timers.js中是imported|offset|length|style|CODE|4616294|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/nodejs/node/blob/19ffb5cf1c50e9d91d0a7a35152d20f175a2385d/src/timer_wrap.cc#L148|1|https://github.com/nodejs/node/blob/19ffb5cf1c50e9d91d0a7a35152d20f175a2385d/src/timer_wrap.cc#L50|2|https://github.com/nodejs/node/blob/19ffb5cf1c50e9d91d0a7a35152d20f175a2385d/lib/timers.js#L3^0|0|A|A|Y|5|19|D|5|4|0|Q|7|1|1O|8|2|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@$D|V|E|W|F|G]|$D|X|E|Y|F|G]|$D|Z|E|10|F|G]]|9|@$D|11|E|12|1|13]|$D|14|E|15|1|16]|$D|17|E|18|1|19]]|A|$]]|$1|H|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]|P|$5|K|L|M|A|$N|Q]]|R|$5|K|L|M|A|$N|S]]]]

This function returns internal module, like require. It's not public, so you shouldn't rely on it in your code, but you can use it to play with node's low level objects, if you want to understand how things work.

For example, <a href="https://github.com/nodejs/node/blob/19ffb5cf1c50e9d91d0a7a35152d20f175a2385d/src/timer_wrap.cc#L148">here</a> <code>timer_wrap</code> binding is registered. It <a href="https://github.com/nodejs/node/blob/19ffb5cf1c50e9d91d0a7a35152d20f175a2385d/src/timer_wrap.cc#L50">exports</a> <code>Timer</code> constructor. In <code>lib/timers.js</code> it's <a href="https://github.com/nodejs/node/blob/19ffb5cf1c50e9d91d0a7a35152d20f175a2385d/lib/timers.js#L3">imported</a>

blocks|key|110087|text|它本质上是一种获取C%2B%2B特性并使其在javascript中可用的特性。以zlib中使用的process.binding('zlib')为例|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|110088|这实际上是获取zlib对象，然后在其余时间在C%2B%2B代码中使用。|110089|因此，当您使用zlib时，您实际上并不是在获取C%2B%2B库，而是在使用为您包装C%2B%2B特性的Javascript库。|110090|它使它更易于使用|110091|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/nodejs/node/blob/master/lib/zlib.js^0|18|N|10|4|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@$9|W|A|X|1|Y]]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|10|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|11|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|M|$N|$5|O|P|Q|E|$R|S]]]]

It's a feature that essentially goes out and grab the C++ feature and make it available inside the javascript .
Take this example <code>process.binding('zlib')</code> that is used in <a href="https://github.com/nodejs/node/blob/master/lib/zlib.js" rel="noreferrer">zlib</a> 

This is essentially going out and getting the zlib C++ object and then it's being used the rest of the time in the javascript code.

So when you use zlib you're not actually going out
and grabbing the C++ library, you're using the Javascript library that wraps the C++ feature for you. 

It makes it easier to use

blocks|key|4616422|text|process.binding将Node.js的Javascript端连接到Node.js的C%2B%2B端。node.js的C%2B%2B端是该节点所做的所有事情的大量内部工作实际实现的地方。所以你的很多代码最终都依赖于C%2B%2B代码。Node.js正在使用C%2B%2B的强大功能。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4616423|下面是一个示例：|4616424|const+crypto=require(“crypto”)
const+start=Date.now()
crypto.pbkdf2(“a”,+“b”,+100000,512,sha512,()=>{
console.log(“1”:Date.now()-start)
})|code-block|syntax|javascript|4616425|Crypto是Node.js中用于散列和保存密码的内置模块。这就是我们在node.js中实现它的方式，但实际的哈希过程发生在Node.js的C%2B%2B端。|4616426|当node.js运行该函数时，实际上在该函数内部，它将所有参数传递给PBKDF2()函数，该函数是c%2B%2B代码。此函数执行所有计算并返回结果。这就是PBKDF如何导入到node.js的javascript端。|offset|length|style|CODE|4616427|const+{PBKDF2}=process.binding(“crypto”)|4616428|这就是node.js的javascript端连接到node.js的c%2B%2B端的方式。在node.js的c%2B%2B端，V8将把node.js值转换成它们的c%2B%2B等效值。|4616429|entityMap^0|0|0|0|0|Y|8|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|10|8|@$M|11|N|12|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|F|7|13|8|@]|9|@]|A|$G|H]]|$1|S|3|T|5|6|7|14|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

process.binding connects the javascript side of Node.js to the C++ side of the Node.js. C++ side of node.js is where a lot of the internal work of everything that node does, is actually implemented. So a lot of your code relies upon ultimately C++ code. Node.js is using the power of C++. 

Here is an example:

<pre><code>const crypto=require(“crypto”)
const start=Date.now()
crypto.pbkdf2(“a”, “b”, 100000,512,sha512,()=&gt;{
console.log(“1”:Date.now()-start)
})
</code></pre>

Crypto is a built-in module in Node.js for hashing and saving passwords. This is how we implement it in Node.js but actual hashing process takes place in C++ side of node.js. 

when node.js runs this function, actually inside of this function, it passes all the arguments to the <code>PBKDF2()</code> function which is the c++ code. this function does all the calculations and returns the result. this is how PBKDF imported to the javascript side of the node.js

<pre><code>const {PBKDF2}=process.binding(“crypto”)
</code></pre>

So this is how javascript side of node.js is connected to the c++ side of node.js. in the c++ side of node.js, V8 is going to translate the node.js values into their c++ equivalents.

I've seen <code>process.binding('...')</code> many times while researching through the <a href="https://github.com/nodejs/node">node.js source code on github</a>.

Can anybody explain me what this function does?

Nodejs: What does `process.binding` mean?

我在上搜索的时候见过很多次process.binding('...')。谁能给我解释一下这个函数是做什么的？

问Nodejs：`process.binding`是什么意思？
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