限制导航以防止浏览器在 React App 中挂起

Question

我正在使用 React 进行 Login/Register 的开发，我正在使用 firebase auth 进行身份验证。当用户登录时，我想在根路径或 App 组件上重定向用户。但是我进入了一个无限循环，这给了我这个错误（节流导航以防止浏览器挂起。）

    import React, { useEffect } from "react";
    import ReactDOM from "react-dom";
    import "semantic-ui-css/semantic.min.css";
    import App from "./App";
    import firebase from "firebase";
    import { BrowserRouter, Switch, Route, withRouter } from "react- 
router-dom";
    import Login from "./components/Login";
    import Register from "./components/Register";

    const Root = props => {
      useEffect(() => {
        firebase.auth().onAuthStateChanged(user => {
          if (user) {
            props.history.push("/");
          }
        });
      });
      return (
        <Switch>
          <Route exact path="/" component={App} />
          <Route path="/login" component={Login} />
          <Route path="/register" component={Register} />
        </Switch>
      );
    };

    const RootWithAuth = withRouter(Root);

    ReactDOM.render(
      <BrowserRouter>
        <RootWithAuth />{" "}
      </BrowserRouter>,
      document.getElementById("root")
    );

Answer 1

你的问题在useEfect, 来自React:

If you’re familiar with React class lifecycle methods, you can think of useEffect Hook as componentDidMount, componentDidUpdate, and componentWillUnmount combined.

你的无限循环是因为你目前使用useEfect也作为componentDidUpdate，只需在useEfect末尾添加[]，这将使useEfect充当componentDidMount。

useEffect(() => {
        firebase.auth().onAuthStateChanged(user => {
          if (user) {
            props.history.push("/");
          }
        });
      }, []);

限制导航以防止浏览器在 React App 中挂起

Throttling navigation to prevent the browser from hanging in React App

reactjs

react-router

firebase-authentication

react-hooks