使用 `const` 来声明 ES6 函数并不能使其全局可用，但 `var` 可以

Question

I'm trying to make a function available everywhere once that script is loaded:

"use strict";
const myFunction = () => {}

But when I try to call myFunction() from another script it tells me that it doesn't exist, even though the script was loaded. If I change const to var , it works.

Funnily enough, I've written code like this for a long time and it just appeared now, yet I'm architecturing the same way.

Why is that?

Answer 1

Via MDN :

First, strict mode makes it impossible to accidentally create global variables. In normal JavaScript mistyping a variable in an assignment creates a new property on the global object and continues to "work" (although future failure is possible: likely, in modern JavaScript). Assignments, which would accidentally create global variables, instead throw an error in strict mode.

Ergo, remove 'use strict' .