js样例

// 基础变量声明
let name = "Alice";
const age = 25;

// 函数定义
function greet() {
    console.log(`Hello, ${name}! You are ${age} years old.`);
}

// 事件监听
document.getElementById('myButton').addEventListener('click', function() {
    greet();
});

// ES6箭头函数
const multiply = (a, b) => a * b;
console.log(multiply(2, 3)); // 输出 6

let myVar; // 先声明
myVar = 10; // 再赋值

fetch('https://api.example.com/data')
    .then(response => {
        if (!response.ok) {
            throw new Error('Network response was not ok');
        }
        return response.json();
    })
    .then(data => console.log(data))
    .catch(error => console.error('There has been a problem with your fetch operation:', error));

function setup() {
    const element = document.getElementById('myElement');
    element.addEventListener('click', handleClick);
}

function cleanup() {
    const element = document.getElementById('myElement');
    element.removeEventListener('click', handleClick);
}