1 function getDomain() { 2     var hostname = window.location.hostname; 3     var ip = hostname.match(/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/g); 4     if (ip) { 5         return ip; 6     } 7     var domain = hostname.match(/([a-z0-9][a-z0-9\-]*?\.(?:com|cn|net|org|gov|info|la|cc|co|jp)(?:\.(?:cn|jp))?)$/); 8     if (domain) { 9         return domain[0];10     }11     return hostname;12 }