js获取客户端mac地址

function setDeviceId() {
    let deviceId = getCookie('deviceId');
    if (!deviceId) {
        deviceId = generateUniqueId();
        setCookie('deviceId', deviceId, 365);
    }
    return deviceId;
}

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

function setCookie(name, value, days) {
    const date = new Date();
    date.setTime(date.getTime() + (days*24*60*60*1000));
    const expires = `expires=${date.toUTCString()}`;
    document.cookie = `${name}=${value}; ${expires}; path=/`;
}

function generateUniqueId() {
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
        const r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
        return v.toString(16);
    });
}

// 使用示例
const deviceId = setDeviceId();
console.log('Device ID:', deviceId);