js方法中怎么传递参数个数

function sum(...numbers) {
  return numbers.reduce((accumulator, currentValue) => accumulator + currentValue, 0);
}

console.log(sum(1, 2, 3, 4)); // 输出: 10
console.log(sum(5, 10));      // 输出: 15

function greet(name = "World") {
  return `Hello, ${name}!`;
}

console.log(greet());          // 输出: Hello, World!
console.log(greet("Alice"));   // 输出: Hello, Alice!

function showArguments() {
  for (let i = 0; i < arguments.length; i++) {
    console.log(arguments[i]);
  }
}

showArguments(1, "test", true);
// 输出:
// 1
// test
// true

function validateArgs(requiredCount, ...args) {
  if (args.length < requiredCount) {
    throw new Error(`Expected at least ${requiredCount} arguments.`);
  }
}

try {
  validateArgs(2, 1); // 这将抛出错误
} catch (e) {
  console.error(e.message);
}