js本地保存数据

// 设置cookie
document.cookie = "username=John Doe; expires=Thu, 18 Dec 2023 12:00:00 UTC; path=/";

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

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

// 设置数据
localStorage.setItem('username', 'John Doe');

// 读取数据
const username = localStorage.getItem('username');

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

// 清空所有数据
localStorage.clear();

// 设置数据
sessionStorage.setItem('username', 'John Doe');

// 读取数据
const username = sessionStorage.getItem('username');

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

// 清空所有数据
sessionStorage.clear();

// 打开数据库
const request = indexedDB.open('myDatabase', 1);

request.onupgradeneeded = function(event) {
    const db = event.target.result;
    const objectStore = db.createObjectStore('users', { keyPath: 'id' });
    objectStore.createIndex('username', 'username', { unique: false });
};

request.onsuccess = function(event) {
    const db = event.target.result;
    const transaction = db.transaction(['users'], 'readwrite');
    const objectStore = transaction.objectStore('users');
    const request = objectStore.add({ id: 1, username: 'John Doe' });

    request.onsuccess = function() {
        console.log('User added successfully');
    };
};