如何使用JavaScript设置函数参数？

function greet(name, age) {
  console.log(`Hello ${name}, you are ${age} years old.`);
}

greet("John", 25);

function greet(name = "Anonymous", age = 18) {
  console.log(`Hello ${name}, you are ${age} years old.`);
}

greet(); // 输出：Hello Anonymous, you are 18 years old.

function greet(person) {
  const { name, age } = person;
  console.log(`Hello ${name}, you are ${age} years old.`);
}

greet({ name: "John", age: 25 });

function sum(...numbers) {
  let total = 0;
  for (let number of numbers) {
    total += number;
  }
  return total;
}

console.log(sum(1, 2, 3, 4, 5)); // 输出：15