不同域名同步登录

// 设置Cookie的Domain属性
document.cookie = "username=John Doe; domain=.example.com; path=/";

// 在前端发送跨域请求时携带Cookie
fetch('https://subdomain.example.com/api', {
    method: 'GET',
    credentials: 'include'
});

// 客户端存储Token
localStorage.setItem('token', 'your_jwt_token');

// 客户端发送请求时携带Token
fetch('https://subdomain.example.com/api', {
    method: 'GET',
    headers: {
        'Authorization': 'Bearer ' + localStorage.getItem('token')
    }
});

// 客户端发起OAuth认证请求
window.location.href = 'https://auth.example.com/oauth/authorize?client_id=YOUR_CLIENT_ID&redirect_uri=YOUR_REDIRECT_URI&response_type=code&scope=email';

// 处理回调并获取Token
fetch('https://auth.example.com/oauth/token', {
    method: 'POST',
    headers: {
        'Content-Type': 'application/x-www-form-urlencoded'
    },
    body: 'grant_type=authorization_code&code=YOUR_AUTHORIZATION_CODE&redirect_uri=YOUR_REDIRECT_URI&client_id=YOUR_CLIENT_ID&client_secret=YOUR_CLIENT_SECRET'
})
.then(response => response.json())
.then(data => {
    localStorage.setItem('token', data.access_token);
});