使用JavaScript检测函数参数名称

本是古典何须时尚 2023-02-22 03:38 17阅读 0赞

I was recently looking over the [promisify-node][] code to see how the author was able to convert basic functions and objects to a promised-based API.  I quickly realized that they were reading function signatures to look for common callback argument names like `callback` and `cb`.  The strategy seemed odd but probably necessary.

我最近正在查看[promisify节点][promisify-node]代码，以了解作者如何将基本功能和对象转换为基于承诺的API。 我很快意识到，他们正在读取函数签名以查找常见的回调参数名称，例如`callback`和`cb` 。 该策略似乎很奇怪，但可能是必要的。

I took a few minutes to pick out the JavaScript function which parsed argument names for a function and here it is:

我花了几分钟时间挑选出JavaScript函数，该函数解析了函数的参数名称，如下所示：

So given the function above and a sample function, here's how it would work:

因此，鉴于上述功能和示例功能，这是它的工作方式：

function myCustomFn(arg1, arg2,arg3) {
      
    }
    
    console.log(getArgs(myCustomFn)); // ["arg1", "arg2", "arg3"]

Aren't regular expressions a beautiful thing?  I can't name many uses for such a function but here it is if you're looking to do such a thing!

正则表达式不是美丽的东西吗？ 我不能说这种功能有很多用途，但是如果您正在寻找做这样的事情，那就在这里！

> 翻译自: [https://davidwalsh.name/javascript-arguments][https_davidwalsh.name_javascript-arguments]

[promisify-node]: https://github.com/nodegit/promisify-node
[https_davidwalsh.name_javascript-arguments]: https://davidwalsh.name/javascript-arguments