Question

How to use this in function with JavaScript

Answer 1

function f() {
  return this;
}
 
console.log(f());
 
console.log(f() === window);
 
console.log(f() === globalThis);
 
 
 
 
/*
run:
 
: [object Window]
true
true
 
*/

 

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Answer 2

function f() {
  'use strict'
  return this;
}

console.log(f());

console.log(f() === window);

console.log(f() === globalThis);

console.log(f() === undefined);




/*
run:

undefined
false
false
true

*/

 

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