js 临时保存数据

// 存储数据
localStorage.setItem('username', 'JohnDoe');

// 获取数据
const username = localStorage.getItem('username');
console.log(username); // 输出: JohnDoe

// 删除数据
localStorage.removeItem('username');

// 清空所有数据
localStorage.clear();

// 存储数据
sessionStorage.setItem('tempData', 'TemporaryData');

// 获取数据
const tempData = sessionStorage.getItem('tempData');
console.log(tempData); // 输出: TemporaryData

// 删除数据
sessionStorage.removeItem('tempData');

// 清空所有数据
sessionStorage.clear();

// 设置cookie
document.cookie = "username=JohnDoe; expires=Fri, 31 Dec 9999 23:59:59 GMT; path=/";

// 获取cookie
function getCookie(name) {
    const value = `; ${document.cookie}`;
    const parts = value.split(`; ${name}=`);
    if (parts.length === 2) return parts.pop().split(';').shift();
}

const username = getCookie('username');
console.log(username); // 输出: JohnDoe

// 删除cookie
document.cookie = "username=; expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/";