如何查找函数中定义的变量
假设我有一个很长的 JavaScript 函数，例如
function test() {
var x;
var a;
...
...
...
...
...
}
有什么方法可以让函数本身告诉我到目前为止定义了哪些变量。
function test() {
var x;
var a;
...
...
...
...
... // bit of code that would say to me: x and a.
}
Suppose I have a long javascript function such as
function test() {
var x;
var a;
...
...
...
...
...
}
is there any way I can ask the function itself to tell me what variables were defined so far.
function test() {
var x;
var a;
...
...
...
...
... // bit of code that would say to me: x and a.
}
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评论（2）
不，不依赖
Function#toString然后对结果执行字符串处理，这是不推荐的。Function#toString由大多数浏览器实现，为您提供函数的源代码（带或不带注释，具体取决于），但没有由规范标准化（即使是最新的），我不会不要在生产代码中使用它。No, not without relying on
Function#toStringand then performing string processing on the result, which is not recommend.Function#toStringis implemented by most browsers as giving you the source code of the function (with or without comments, depending), but isn't standardized by the spec (even the latest) and I wouldn't use it in production code.这需要反思。但 Javascript 并没有太多的反射支持。我不认为你能做到这一点，除了这样：解析你自己的函数。
That would require reflection. But Javascript comes without very much any reflection support. I don't think you can do it, except like this: parse your own function.