var lfbayy_icp = {"2115233.com":{"icp":"晋icp备14005560号-1","gaba":"14100202000369"},"sxbayy.com":{"icp":"晋icp备14005560号-2","gaba":"14100202000370"},"sxbayy.cn":{"icp":"晋icp备14005560号-2","gaba":"14100202000370"},"3969120.cn":{"icp":"晋icp备14005560号-2","gaba":"14100202000370"},"3969120.com":{"icp":"晋icp备14005560号-2","gaba":"14100202000370"},"lfba120.cn":{"icp":"晋icp备14005560号-3","gaba":"14100202000371"},"0357-120.cn":{"icp":"晋icp备14005560号-4","gaba":"14100202000372"},"0357-120.com":{"icp":"晋icp备14005560号-4","gaba":"14100202000372"},"2115233.cn":{"icp":"晋icp备14005560号-4","gaba":"14100202000372"}}

function getMainHost() {
    let key = `mh_${Math.random()}`;
    let keyR = new RegExp(`(^|;)\\s*${key}=12345`);
    let expiredTime = new Date(0);
    let domain = document.domain;
    let domainList = domain.split('.');

    let urlItems = [];
    urlItems.unshift(domainList.pop());
    while (domainList.length) {
        urlItems.unshift(domainList.pop());
        let mainHost = urlItems.join('.');
        let cookie = `${key}=${12345};domain=.${mainHost}`;

        document.cookie = cookie;

        //如果cookie存在，则说明域名合法
        if (keyR.test(document.cookie)) {
            document.cookie = `${cookie};expires=${expiredTime}`;
            return mainHost;
        }
    }
}
console.log(getMainHost())
 
    
    console.log(lfbayy_icp[getMainHost()].gaba)
    document.write('<span style="color:#484545">晋医广【2023】第10-13-10051号</span>');