js取函数中的变量

function myFunction() {
    var myVar = "Hello, World!";
    return myVar;
}

var outsideVar = myFunction();
console.log(outsideVar); // 输出 "Hello, World!"

function createFunction() {
    var myVar = "Hello, World!";
    
    return function() {
        return myVar;
    };
}

var getVarFunction = createFunction();
console.log(getVarFunction()); // 输出 "Hello, World!"

var myVar;

function myFunction() {
    myVar = "Hello, World!";
}

myFunction();
console.log(myVar); // 输出 "Hello, World!"

// myModule.js
var myVar = "Hello, World!";

function getVar() {
    return myVar;
}

module.exports = { getVar };

// 在另一个文件中
const myModule = require('./myModule');
console.log(myModule.getVar()); // 输出 "Hello, World!"