js 常见封装方法

function greet(name) {
    console.log(`Hello, ${name}!`);
}

greet('Alice'); // 输出: Hello, Alice!

const person = {
    name: 'Alice',
    age: 25,
    greet: function() {
        console.log(`Hello, my name is ${this.name} and I am ${this.age} years old.`);
    }
};

person.greet(); // 输出: Hello, my name is Alice and I am 25 years old.

// math.js
export function add(a, b) {
    return a + b;
}

export function subtract(a, b) {
    return a - b;
}

// main.js
import { add, subtract } from './math.js';

console.log(add(5, 3)); // 输出: 8
console.log(subtract(5, 3)); // 输出: 2

class Person {
    constructor(name, age) {
        this.name = name;
        this.age = age;
    }

    greet() {
        console.log(`Hello, my name is ${this.name} and I am ${this.age} years old.`);
    }
}

const person = new Person('Alice', 25);
person.greet(); // 输出: Hello, my name is Alice and I am 25 years old.

function createCounter() {
    let count = 0;
    return {
        increment: function() {
            count++;
            console.log(count);
        },
        decrement: function() {
            count--;
            console.log(count);
        }
    };
}

const counter = createCounter();
counter.increment(); // 输出: 1
counter.increment(); // 输出: 2
counter.decrement(); // 输出: 1