提问人:Lax1177 提问时间:4/26/2022 最后编辑:Ted LyngmoLax1177 更新时间:4/26/2022 访问量:1745
获取“未捕获的 TypeError:无法读取未定义的属性(读取'Items')”
Getting " Uncaught TypeError: Cannot read properties of undefined (reading 'Items')"
问:
我在我正在处理的 react 项目上遇到此错误“Expenses.js:8 未捕获的 TypeError:无法读取未定义的属性(读取'Items')”,我不确定为什么我一直得到它。我是 REACT 的新手。非常感谢任何帮助
这是我的文件代码
App.js
import Expenses from "./components/Expenses";
function App() {
const expenses = [
{
id: "e1",
title: "Toilet Paper",
amount: 94.12,
date: new Date(2020, 7, 14),
},
{ id: "e2", title: "New TV", amount: 799.49, date: new Date(2021, 2, 12) },
{
id: "e3",
title: "Car Insurance",
amount: 294.67,
date: new Date(2021, 2, 28),
},
{
id: "e4",
title: "New Desk (Wooden)",
amount: 450,
date: new Date(2021, 5, 12),
},
];
return (
<div>
<h2>Let's get started!</h2>
<Expenses Items={expenses} />
</div>
);
}
export default App;
Expense.js
import ExpenseItem from "./ExpenseItem";
import "./Expenses.css";
function Expenses(props) {
return (
<div className="expenses">
<ExpenseItem
title={props.Items[0].title}
amount={props.Items[0].amount}
date={props.Items[0].date}
/>
<ExpenseItem
title={props.Items[1].title}
amount={props.Items[1].amount}
date={props.Items[1].date}
/>
<ExpenseItem
title={props.Items[2].title}
amount={props.Items[2].amount}
date={props.Items[2].date}
/>
<ExpenseItem
title={props.Items[3].title}
amount={props.Items[3].amount}
date={props.Items[3].date}
/>
</div>
);
}
export default Expenses();
答:
2赞
R4ncid
4/26/2022
#1
要解决错误,您应该更改为export default Expenses();
export default Expenses;
您还应该以这种方式重构代码
import ExpenseItem from "./ExpenseItem";
import "./Expenses.css";
function Expenses(props) {
return (
<div className="expenses">
{props.Items.map((item, i) => <ExpenseItem
key={i}
title={item.title}
amount={item.amount}
date={item.date}
/>)}
</div>
);
}
export default Expenses;
-1赞
Lax1177
4/26/2022
#2
没关系。我找到了答案。
在我比较App.js和Expenses.js后,我发现我把Expenses.js的export default写错了(应该只是export default Expenses;
此问题已解决
评论
export default Expenses();
export default Expenses;