如何在方法中创建全局对象？

// 直接在window上定义属性或方法
window.myGlobalVariable = 'Hello, World!';
window.myGlobalFunction = function() {
    console.log('This is a global function');
};

// 访问全局变量和方法
console.log(window.myGlobalVariable); // 输出: Hello, World!
window.myGlobalFunction(); // 输出: This is a global function

// 直接在global上定义属性或方法
global.myGlobalVariable = 'Hello, World!';
global.myGlobalFunction = function() {
    console.log('This is a global function');
};

// 访问全局变量和方法
console.log(global.myGlobalVariable); // 输出: Hello, World!
global.myGlobalObjectFunction(); // 输出: This is a global function

# 在模块级别定义全局变量
my_global_variable = 'Hello, World!'

def my_function():
    # 在函数内部访问全局变量
    global my_global_variable
    print(my_global_variable)

my_function()  # 输出: Hello, World!

public class GlobalObject {
    private static GlobalObject instance;

    private GlobalObject() {}

    public static GlobalObject getInstance() {
        if (instance == null) {
            instance = new GlobalObject();
        }
        return instance;
    }

    public void doSomething() {
        System.out.println("Doing something with the global object");
    }
}

// 在其他类中使用全局对象
public class Main {
    public static void main(String[] args) {
        GlobalObject global = GlobalObject.getInstance();
        global.doSomething(); // 输出: Doing something with the global object
    }
}