Question

function main() {    Hello(); }  function Hello() {   // How do you find out the caller function is 'main'? } 

Is there a way to find out the call stack?

Answer 1

Note that this solution is deprecated and should no longer be used according to MDN documentation

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/caller

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function Hello() {     alert("caller is " + Hello.caller); } 

Note that this feature is non-standard, from Function.caller:

Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

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The following is the old answer from 2008, which is no longer supported in modern Javascript:

function Hello() {     alert("caller is " + arguments.callee.caller.toString()); }