node. js gets the current function within the function

How does JS know within the function body which function to run inside?

To make an analogy:

function A () {    ///  I want to know here my function name A and functions a () {...}}

The call stack that uses error can match the function that is executed during the current period:

//     Gets the function that is being executed   getexecfunction ()    {new Error (). Stack.match (/at (. * ?) /g);     = Names[1].replace (' at ', '). Trim ();     return eval (name);}

Use Ex:

function A () {    console.log (getexecfunction ());} function getexecfunction () {    new Error (). Stack.match (/at (. *)/g);     = Names[1].replace (' at ', '). Trim ();     return eval (name);} A ();         // [Function:a]

If it is inside class, you can write this (code based on ES6):

class A {    //  gets the function being executed     getexecfunction () {        new Error (). Stack.match (/at a\. *?) /g);         = Names[1].replace (' at A. ', '). Trim ();         return eval ('this. ${name} ');    A () {        Console.log (this. getexecfunction ());}    } New A (). a ();    //     [function:a]

If there is any mistake, please correct me, thank you.

node. js gets the current function within the function