js 调用一个函数

// 普通函数定义与调用
function greet(name) {
    console.log("Hello, " + name + "!");
}
greet("Alice"); // 输出: Hello, Alice!

// 箭头函数定义与调用
const sayHello = (name) => {
    console.log("Hi, " + name + "!");
};
sayHello("Bob"); // 输出: Hi, Bob!

// 方法调用
const person = {
    firstName: "John",
    lastName: "Doe",
    getFullName: function() {
        return this.firstName + " " + this.lastName;
    }
};
console.log(person.getFullName()); // 输出: John Doe

// 构造函数调用
function Person(firstName, lastName) {
    this.firstName = firstName;
    this.lastName = lastName;
}
const user = new Person("Jane", "Smith");
console.log(user.firstName + " " + user.lastName); // 输出: Jane Smith