js function ()

const obj = {
    name: 'Alice',
    greet: function() {
        setTimeout(function() {
            console.log(`Hello, ${this.name}`);
        }, 100);
    }
};

obj.greet(); // 输出: Hello, undefined

const obj = {
    name: 'Alice',
    greet: function() {
        setTimeout(() => {
            console.log(`Hello, ${this.name}`);
        }, 100);
    }
};

obj.greet(); // 输出: Hello, Alice

function calculate(a, b) {
    return a + b;
}

console.log(calculate('1', 2)); // 输出: '12'

console.log(calculate(1, 2)); // 输出: 3

function outer() {
    var x = 10;
    function inner() {
        console.log(x);
    }
    return inner;
}

var innerFunc = outer();
innerFunc(); // 输出: 10

// 定义一个函数，用于计算数组中所有数字的和
function sumArray(numbers) {
    return numbers.reduce((total, num) => total + num, 0);
}

// 使用示例
const numbers = [1, 2, 3, 4, 5];
console.log(sumArray(numbers)); // 输出: 15