How to get domain name only using javascript?

Question

I want to get domain name only using javascript. Ex

vn.search.yahoo.com -> yahoo
vn.search.yahoo.com.vn -> yahoo
sub1.sub2.sub3.abcdef.co.uk -> abcd         


        

Answer 1

The only way I can imagine is list all the TLD. Sample code like below.

function getDomainName(){
    var domainList = ['com','org','net',...];//all  TLD
    var tokens = document.domain.split('.');
    while(tokens.length){
        var token = tokens.pop();
        if( domainList.indexOf(token) == -1 ){
            return token;
        }
    }
    return null;
}

Array.prototype.indexOf should do some fix in IE.