相关疑难解决方法(0)

我正在尝试创建 Google 身份验证，但我复制var provider = new firebase.auth.GoogleAuthProvider();到我的 JavaScript 并且它一直告诉我Uncaught ReferenceError: firebase is not defined.

这是我的代码：

var provider = new firebase.auth.GoogleAuthProvider();

function signin(){

  firebase.auth().signInWithPopup(provider).then(function(result) {

  var token = result.credential.accessToken;
  var user = result.user;

}).catch(function(error) {

  var errorCode = error.code;
  var errorMessage = error.message;
  var email = error.email;
  var credential = error.credential;

}); 
}