JS in caller and callee

Caller

Caller is a property of a function object that refers to the caller of the function object, and returns NULL if the caller is the top-level caller.

Cases:

function func () {     console.log (func.caller);} function obj () {    func (); //   The caller is the obj function }obj (); func ()  ; // The caller is a top-level object,  so null

Callee

Callee is a property of the arguments object that points to a reference to this function

function func () {      console.log (Arguments.callee)// current callee pointer to the Func function reference } func ();

The callee property has a length property, and length is the current function parameter property.

function func (A, b) {       console.log (arguments.callee.length)//  2  } func (1);

JS in caller and callee