a simple url parser demo

parser.js

var maps = {
    'weibo': 'fa-weibo'
}

var parse = function(url) {
    var a = document.createElement('a');
    a.href = url;
    return a;
}

var checker = function(url) {
    var host = parse(url).host.split('.');
    host = host.slice(host.length - 2);
    return maps[host[0]];
}

checker('http://github.com.weibo.weibo.com/');