📅  最后修改于: 2022-03-11 15:01:13.561000             🧑  作者: Mango
import React from "react";
import ReactDOM from "react-dom";
import "./styles.css";
class App extends React.Component {
constructor(props) {
super(props);
this.switchImage = this.switchImage.bind(this);
this.state = {
currentImage: 0,
images: [
"https://images.unsplash.com/photo-1518791841217-8f162f1e1131?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&w=1000&q=80",
"https://img.purch.com/w/660/aHR0cDovL3d3dy5saXZlc2NpZW5jZS5jb20vaW1hZ2VzL2kvMDAwLzEwNC84MzAvb3JpZ2luYWwvc2h1dHRlcnN0b2NrXzExMTA1NzIxNTkuanBn",
"https://d17fnq9dkz9hgj.cloudfront.net/uploads/2012/11/152964589-welcome-home-new-cat-632x475.jpg",
"https://i.ytimg.com/vi/jpsGLsaZKS0/maxresdefault.jpg"
]
};
}
switchImage() {
if (this.state.currentImage < this.state.images.length - 1) {
this.setState({
currentImage: this.state.currentImage + 1
});
} else {
this.setState({
currentImage: 0
});
}
return this.currentImage;
}
componentDidMount() {
setInterval(this.switchImage, 1000);
}
render() {
return (
);
}
}
const rootElement = document.getElementById("root");
ReactDOM.render( , rootElement);