javascript - In a nested-loop JS function, does 'return' exit the loop, or the whole function?

To exit a loop use always the keyword break, unless you determine something inside the loop that makes you decide to exit the whole function, and in that case you use return keyword.

The link you posted, about an anonymous function is ingenious, that solution has 3 loops, but depending on a condition the programmer wants to exit the 2 inner loops simultaneously, but not the outer most, so he wrapped the 2 inner loops inside an anonymous function that executes for each iteration of the outer loop, so that when he decides to break the 2 inner loops, he can call return without exiting the outer most.

Regards.