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var parser = function(url) {
  var a = document.createElement('a');
  a.href = url;
  
  var search = function(search) {
    if(!search) return {};
    
    var ret = {};
    search = search.slice(1).split('&');
    for(var i = 0, arr; i < search.length; i++) {
      arr = search[i].split('=');
      ret[arr[0]] = arr[1];
    }
    return ret;
  };
  
  return {
    protocol: a.protocol,
    host: a.host,
    hostname: a.hostname,
    pathname: a.pathname,
    search: search(a.search),
    hash: a.hash
  }
};

var url = 'http://sub.example.com:8023/home/?foo=bar&ciao=cc#hash';
parser(url);

// 结果是？