使用firebase登录后重复刷新页面

Question

登录后，重定向用户重定向的页面。这是javascript代码：

firebase.auth().onAuthStateChanged(function(user) {
  if (user) {
    // User is signed in.

    window.location="comingsoon.html";
    var user = firebase.auth().currentUser;



  } else {
    // No user is signed in.


  }
});

function login(){

  var userEmail = document.getElementById("email_field").value;
  var userPass = document.getElementById("password_field").value;

  firebase.auth().signInWithEmailAndPassword(userEmail, userPass).catch(function(error) {
    // Handle Errors here.
    var errorCode = error.code;
    var errorMessage = error.message;

    window.alert("Error : " + errorMessage);

    // ...
  });

}

function logout(){
  firebase.auth().signOut();

}

Answer 1

执行代码后，您必须取消订阅事件监听功能onAuthStateChanged。要做到这一点，你可以写：

const unsubscribeAfterAuth = firebase.auth().onAuthStateChanged(function (user) {
    if (user) {


    window.location="comingsoon.html";
    var user = firebase.auth().currentUser;


  } else {
    // No user is signed in.


  }
});
unsubscribeAfterAuth();

这样你就不会在第一次调用onAuthStateChanged后获得更新，因为你的函数在第一次调用后不会收听事件。