js中调用function

function greet(name) {
    console.log(`Hello, ${name}!`);
}
greet('World'); // 输出: Hello, World!

const greet = function(name) {
    console.log(`Hello, ${name}!`);
};
greet('World'); // 输出: Hello, World!

const greet = (name) => {
    console.log(`Hello, ${name}!`);
};
greet('World'); // 输出: Hello, World!

function sayHello() {
    console.log('Hello!');
}
sayHello(); // 输出: Hello!

function processArray(arr, callback) {
    for (let i = 0; i < arr.length; i++) {
        callback(arr[i]);
    }
}

processArray([1, 2, 3], function(item) {
    console.log(item * 2);
});
// 输出:
// 2
// 4
// 6

function createMultiplier(factor) {
    return function(number) {
        return number * factor;
    };
}

const double = createMultiplier(2);
console.log(double(5)); // 输出: 10

// 错误示例
greet(); // 报错: greet is not defined

function greet() {
    console.log('Hello!');
}

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

greet(); // 输出: Hello, undefined!
greet(123); // 输出: Hello, 123!

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

obj.greet(); // 输出: Hello, Alice!