Usage

<template>
    <div>
        <LanguageSelect :countries="countries" :onchange="changeLanguage"/>
    </div>
</template>


<script>
import LanguageSelect from 'country-select'
export default {
    components:{
        LanguageSelect
    },
    data(){
        return {
            countries:[
                {
                    title:'GB',             // national flag
                    text: 'English',        // country name
                    value: 'en',            // will return on onchange callback
                    select: localStorage.getItem('locale')=='en'?1:0    // default country select
                },
                {
                    title:'CN',
                    text: 'Chinese',
                    value: 'zh',
                    select: localStorage.getItem('locale')=='zh'?1:0
                }
            ]
        }
    }
}
<script>

National flag optional

AC--America
AD--Andorra
AE--United Arab Emirates
AF--Afghanistan
AG--Antigua and Barbuda
AL--Albania
AM--Armenia
AO--Angola
AR--Argentina
AT--Austria
AU--Australia
AW--Aruba
AZ--Azerbaijan
BA--Bosnia and Herzegovina
BB--Barbados
BD--Bangladesh
BE--Belgium
BF--Burkina Faso
BG--Bulgaria
BH--Bahrain
BI--Burundi
BJ--Benin
BM--Bermuda
BN--Brunei
BO--Bolivia
BR--Brazil
BS--Bahamas
BT--Bhutan
BW--Botswana
BY--Belarus
BZ--Belize
CA--Canada
CD--Democratic Republic of the Congo
CF--Central African Republic
CG--Democratic Republic of the Congo
CH--Switzerland
CL--Chile
CM--Cameroon
CN" selected="selected">China
CO--Colombia
CR--Costa Rica
CU--Cuba
CV--Cape Verde
CY--Cyprus
CZ--Czech Republic
DE--Germany
DJ--Djibouti
DK--Denmark
DM--Dominica
DO--Dominican Republic
DZ--Algeria
EC--Ecuador
EE--Estonia
EG--Egypt
ER--Eritrea
ES--Spain
ET--Ethiopia
FI--Finland
FJ--Fiji
FK--Falkland Islands
FM--Micronesia
FO--Faroe Islands
FR--France
GA--Gabon
GB--United Kingdom
GD--Grenada
GE--Georgia
GH--Ghana
GI--Gibraltar
GM--Gambia
GN--Guinea
GQ--Equatorial Guinea
GR--Greece
GT--Guatemala
GW--Guinea-Bissau
GY--Guyana
HK--Hong Kong
HN--Honduras
HR--Croatia
HT--Haiti
HU--Hungary
ID--Indonesia
IE--Ireland
IL--Israel
IN--India
IQ--Iraq
IR--Iran
IS--Iceland
IT--Italy
JM--Jamaica
JO--Jordan
JP--Japan
KE--Kenya
KG--Kyrgyzstan
KH--Cambodia
KI--Kiribati
KM--Comoros
KN--Saint Kitts and Nevis
KP--North Korea
KR--South Korea
KW--Kuwait
KY--Cayman Islands
KZ--Kazakhstan
LA--Laos
LB--Lebanon
LC--Saint Lucia
LI--Liechtenstein
LK--Sri Lanka
LR--Liberia
LS--Lesotho
LT--Lithuania
LU--Luxembourg
LV--Latvia
LY--Libya
MA--Morocco
MC--Monaco
MD--Moldova
ME--Montenegro
MG--Madagascar
MK--Macedonia
ML--Mali
MM--Myanmar
MN--Mongolia
MO--Macao
MR--Mauritania
MT--Malta
MU--Mauritius
MV--Maldives
MW--Malawi
MX--Mexico
MY--Malaysia
MZ--Mozambique
NA--Namibia
NE--Niger
NG--Nigeria
NI--Nicaragua
NL--Netherlands
NO--Norway
NP--Nepal
NR--Nauru
NZ--New Zealand
OM--Oman
PA--Panama
PE--Peru
PG--Papua New Guinea
PH--Philippines
PK--Pakistan
PL--Poland
PR--Puerto Rico
PS--Palestine
PT--Portugal
PW--Palau
PY--Paraguay
QA--Qatar
RO--Romania
RS--Serbia
RU--Russia
RW--Rwanda
SA--Saudi Arabia
SB--Solomon Islands
SC--Seychelles
SD--Sudan
SE--Sweden
SG--Singapore
SI--Slovenia
SK--Slovak Republic
SL--Sierra Leone
SM--San Marino
SN--Senegal
SO--Somalia
SR--Suriname
ST--Sao Tome and Principe
SV--El Salvador
SY--Syria
SZ--Swaziland
TD--Chad
TG--Togo
TH--Thailand
TJ--Tajikistan
TM--Turkmenistan
TN--Tunisia
TO--Tonga
TR--Turkey
TT--Trinidad and Tobago
TV--Tuvalu
TZ--Tanzania
UA--Ukraine
UG--Uganda
UY--Uruguay
UZ--Uzbekistan
VC--Saint Vincent And The Grenadine
VE--Venezuela
VG--British Virgin Islands
VN--Vietnam
VU--Vanuatu
WF--Wallis and Futuna
WS--Western Samoa
YE--Yemen
ZA--South Africa
ZM--Zambia
ZW--Zimbabwe