Đăng nhập bằng Google với javascript

  var CLIENT_ID="603591966546-u9599alur4m8oojsrdt2voarhclm5os4.apps.googleusercontent.com";

function oauthSignIn() {

  var oauth2Endpoint = 'https://accounts.google.com/o/oauth2/v2/auth';

  var form = document.createElement('form');

  form.setAttribute('method', 'GET'); 

  form.setAttribute('action', oauth2Endpoint);

  var params = {'client_id': CLIENT_ID,

                'redirect_uri': 'https://iif.vn',

                'response_type': 'token',

                'scope': 'https://www.googleapis.com/auth/userinfo.email https://www.googleapis.com/auth/userinfo.profile',

                'include_granted_scopes': 'true',

                'state': 'pass-through value'};

  for (var p in params) {

    var input = document.createElement('input');

    input.setAttribute('type', 'hidden');

    input.setAttribute('name', p);

    input.setAttribute('value', params[p]);

    form.appendChild(input);

  }

  document.body.appendChild(form);

  form.submit();

}

const getToken= () =>{

  searchParams = new URLSearchParams(window.location.search);

  tk=  searchParams.get("access_token");

  return tk;

}

//alert("chao ${getToken}");

const getUserInfor= async() =>

{

    const tk =  getToken();

    if(tk!=null)

    {

        //url="https://www.googleapis.com/oauth2/v3/tokeninfo?access_token="+tk

        url="https://www.googleapis.com/oauth2/v3/userinfo?access_token="+tk

        alert(url);

        const respone = await fetch(url);

        //alert(respone);

        const data = await respone.json();

        alert(data.email);

        alert(data.picture);

    }

}

getUserInfor();