如何得到这个json里types是country的short_name

{"address_components" : [
            {
               "long_name" : "209省道",
               "short_name" : "S209",
               "types" : [ "route" ]
            },
            {
               "long_name" : "忻城县",
               "short_name" : "忻城县",
               "types" : [ "sublocality", "political" ]
            },
            {
               "long_name" : "来宾市",
               "short_name" : "来宾市",
               "types" : [ "locality", "political" ]
            },
            {
               "long_name" : "广西壮族自治区",
               "short_name" : "广西壮族自治区",
               "types" : [ "administrative_area_level_1", "political" ]
            },
            {
               "long_name" : "中国",
               "short_name" : "CN",
               "types" : [ "country", "political" ]
            }
         ]
}

var names = [];
for (var i = 0; i < jsonObj.address_components.length; i++) {
  var addr = jsonObj.address_components[i];
  for (var j = 0; j < addr.types.length; j++) {
    if (addr.types[j] == 'country') {
       names.push(addr.short_name);
       break;
    }
  }
}