js 方法带参数

function functionName(parameter1, parameter2, ...) {
    // 函数体
}

// 定义一个函数，接受两个参数并返回它们的和
function add(a, b) {
    return a + b;
}

// 调用函数，传递实参
let sum = add(5, 3); // sum 的值为 8

function greet(name) {
    console.log("Hello, " + name.toUpperCase()); // 如果name未定义，会抛出错误
}

greet(); // ReferenceError: name is not defined

function greet(name = "Guest") {
    console.log("Hello, " + name.toUpperCase());
}

greet(); // Hello, GUEST

function add(a, b) {
    return a + b;
}

let result = add("5", 3); // "53" 而不是 8

function add(a, b) {
    if (typeof a !== 'number' || typeof b !== 'number') {
        throw new TypeError('Both arguments must be numbers');
    }
    return a + b;
}

let result = add(5, 3); // 8

function greet(firstName, lastName) {
    console.log("Hello, " + firstName + " " + lastName);
}

greet("John"); // Hello, John undefined

function greet(firstName, lastName = "Doe") {
    console.log("Hello, " + firstName + " " + lastName);
}

greet("John"); // Hello, John Doe