前言
app.js
import React, {useState} from 'react';
import './App.css';
const App = () => {
const [redBorder, setRedBorder] = useState(true);
// const pStyle = {
// color: 'red',
// backgroundColor: '#bfa',
// border: redBorder ? "red solid 1px" : "blue solid 1px"
// };
const clickHandler = () => {
setRedBorder(false);
};
return (
<div>
<p className={`p1 ${redBorder?'':'blueBorder'}`}>我是一个段落</p>
<button onClick={clickHandler}>点我一下</button>
</div>
);
};
export default App;
app.css
.p1{
color: red;
background-color: #bfa;
border: 1px red solid;
}
.blueBorder{
border: 1px blue solid;
}