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[英]Uncaught TypeError: undefined is not iterable (cannot read property Symbol(Symbol.iterator)) Not sure what to do
[英]Clicking on React NavLink causes error: Uncaught (in promise) TypeError: undefined is not iterable (cannot read property Symbol(Symbol.iterator))
在我的 React 項目中,我的 Navbar 組件中有以下 NavLinks:
import { NavLink } from "react-router-dom";
import { Container, Menu } from "semantic-ui-react";
const Navbar = () => (
<div>
<Menu fixed="top" inverted>
<Container>
<Menu.Item as="a" header>
React Markdown Blog
</Menu.Item>
<NavLink to="/"><Menu.Item as="li">Posts</Menu.Item></NavLink>
<NavLink to="/create"><Menu.Item as="li">Create a post</Menu.Item></NavLink>
</Container>
</Menu>
</div>
);
export default Navbar;
當我嘗試單擊其中任何一個時,請求的頁面不會加載,並且我的控制台中會顯示以下錯誤消息:
Uncaught (in promise) TypeError: undefined is not iterable (cannot read property Symbol(Symbol.iterator))
at background.js:20
at n (background.js:20)
at background.js:18
at l (background.js:27)
at Generator._invoke (background.js:27)
at Generator.next (background.js:27)
at n (background.js:49)
at u (background.js:49)
有沒有人知道如何解決這個問題或提供線索是什么問題?
對於其他上下文,我的 App.js 文件如下:
import "semantic-ui-css/semantic.min.css";
import { Router, Route, Switch } from "react-router-dom";
import { createBrowserHistory } from "history";
import Layout from "./containers/Layout";
import PostList from "./containers/PostList";
import PostDetail from "./containers/PostDetail";
import PostCreate from "./containers/PostCreate";
import PostUpdate from "./containers/PostUpdate";
import PostDelete from "./containers/PostDelete";
const history = createBrowserHistory();
function App() {
return (
<Router history={history}>
<Layout>
<Switch>
<Route exact path="/" component={PostList} />
<Route path="/create" component={PostCreate} />
<Route path="/post/:postSlug" component={PostDetail} />
<Route path="/post/:postSlug/update" component={PostUpdate} />
<Route path="/post/:postSlug/delete" component={PostDelete} />
</Switch>
</Layout>
</Router>
);
}
export default App;
我解決了這個問題:我通過安裝了最新版本(5.0.0)的npm install history
安裝了npm install history
。 但是,在我遵循的教程中,安裝了 4.10.1 版。 我因此收到錯誤消息,因為兩個版本之間存在一些重大更改(另請參閱: https : //github.com/ReactTraining/history/issues/804 )
因此,通過npm install history@4.10.1
降級到 4.10.1 版解決了我的問題。
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