var wsdfyy_icp = {"fysbayy.com":{"icp":"晋ICP备20003024号-1","gaba":""},"fysbafkyy.com":{"icp":"晋ICP备20003024号-2","gaba":""},"fysba120.com":{"icp":"晋ICP备20003024号-3","gaba":""},"fysbankyy.com":{"icp":"晋ICP备20003024号-4","gaba":""},"fybayy.com":{"icp":"晋ICP备20003024号-5","gaba":""}}
 
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())
 
 
 document.write('<a target="_blank" rel="nofollow" style="color:#7d7b7b" href="javascript:void(0)">晋医广【2023】07-10-05014号</a>');