怎么调用js方法调用方法

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

// 调用函数
sayHello();

const person = {
    firstName: 'John',
    lastName: 'Doe',
    getFullName: function() {
        return this.firstName + ' ' + this.lastName;
    }
};

// 调用对象的方法
console.log(person.getFullName()); // 输出: John Doe

function Person(firstName, lastName) {
    this.firstName = firstName;
    this.lastName = lastName;
}

Person.prototype.getFullName = function() {
    return this.firstName + ' ' + this.lastName;
};

const person1 = new Person('John', 'Doe');
console.log(person1.getFullName()); // 输出: John Doe

class Person {
    constructor(firstName, lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }

    getFullName() {
        return this.firstName + ' ' + this.lastName;
    }
}

const person1 = new Person('John', 'Doe');
console.log(person1.getFullName()); // 输出: John Doe

<button id="myButton">Click me</button>

<script>
document.getElementById('myButton').addEventListener('click', function() {
    alert('Button was clicked!');
});
</script>

const numbers = [1, 2, 3, 4, 5];

// 使用forEach方法遍历数组并调用回调函数
numbers.forEach(function(number) {
    console.log(number);
});

function asyncMethod() {
    return new Promise((resolve, reject) => {
        setTimeout(() => resolve('Async method result'), 1000);
    });
}

async function callAsyncMethod() {
    const result = await asyncMethod();
    console.log(result); // 输出: Async method result
}

callAsyncMethod();