Javascript - 访问全局变量时出现问题

var globalVar = "Hello, world!";

function outerFunction() {
  var globalVar = "Hello, world!";

  function innerFunction() {
    console.log(globalVar);
  }

  innerFunction();
}

outerFunction();

window.globalVar = "Hello, world!";
console.log(window.globalVar);

this.globalVar = "Hello, world!";
console.log(this.globalVar);

// module.js
export var globalVar = "Hello, world!";

// main.js
import { globalVar } from "./module.js";
console.log(globalVar);