如何在 React js 中映射 JSON 数据?
How to map JSON data in react js?
我想以键值方式映射 JSON 数据。我在 stackblitz 上尝试过,但显示错误。
我写的代码:
import React from "react";
import ReactDOM from "react-dom";
const sampleJSON = {
name: "Pluralsight",
number: 1,
address: "India",
website: "https://www.pluralsight.com/"
};
function App() {
return (
<div>
{Object.keys(sampleJSON).map((key, i) => (
<p key={i}>
<span>Key Name: {key}</span>
<span>Value: {sampleJSON[key]}</span>
</p>
))}
</div>
);
}
ReactDOM.render(<App />, document.getElementById("app"));
我遇到的错误是:
Error in /turbo_modules/react-dom@17.0.0/cjs/react-dom.development.js (26083:13)
Target container is not a DOM element.
您必须导出默认的 React 组件。通过更改此行
,我让它在沙箱 (link) 中工作
ReactDOM.render(<App />, document.getElementById("app"));
至此
export default App;
您需要导出 app component
而不是将其渲染到元素 ID 应用程序。问题是它试图找到元素 id app
,但在 DOM 中找不到。然而 index.js
做同样的事情,所以你不必做 ReactDOM.render
的事情。
ReactDOM.render(<App />, document.getElementById("root"));
// you will find this line in index.js, you don't need to do this in app.js
import React from "react";
const sampleJSON = {
name: "Pluralsight",
number: 1,
address: "India",
website: "https://www.pluralsight.com/"
};
export default function App() {
return (
<div>
{Object.keys(sampleJSON).map((key, i) => (
<p key={i}>
<span>Key Name: {key}</span>
<span>Value: {sampleJSON[key]}</span>
</p>
))}
</div>
);
}
我想以键值方式映射 JSON 数据。我在 stackblitz 上尝试过,但显示错误。
我写的代码:
import React from "react";
import ReactDOM from "react-dom";
const sampleJSON = {
name: "Pluralsight",
number: 1,
address: "India",
website: "https://www.pluralsight.com/"
};
function App() {
return (
<div>
{Object.keys(sampleJSON).map((key, i) => (
<p key={i}>
<span>Key Name: {key}</span>
<span>Value: {sampleJSON[key]}</span>
</p>
))}
</div>
);
}
ReactDOM.render(<App />, document.getElementById("app"));
我遇到的错误是:
Error in /turbo_modules/react-dom@17.0.0/cjs/react-dom.development.js (26083:13) Target container is not a DOM element.
您必须导出默认的 React 组件。通过更改此行
,我让它在沙箱 (link) 中工作ReactDOM.render(<App />, document.getElementById("app"));
至此
export default App;
您需要导出 app component
而不是将其渲染到元素 ID 应用程序。问题是它试图找到元素 id app
,但在 DOM 中找不到。然而 index.js
做同样的事情,所以你不必做 ReactDOM.render
的事情。
ReactDOM.render(<App />, document.getElementById("root"));
// you will find this line in index.js, you don't need to do this in app.js
import React from "react";
const sampleJSON = {
name: "Pluralsight",
number: 1,
address: "India",
website: "https://www.pluralsight.com/"
};
export default function App() {
return (
<div>
{Object.keys(sampleJSON).map((key, i) => (
<p key={i}>
<span>Key Name: {key}</span>
<span>Value: {sampleJSON[key]}</span>
</p>
))}
</div>
);
}