Javascript 将react函数转换为react类
我正在尝试将react函数转换为react类Javascript 将react函数转换为react类,javascript,reactjs,function,class,classname,Javascript,Reactjs,Function,Class,Classname,我正在尝试将react函数转换为react类 const prevSplash = () => { if (index === 1) { setIndex(0); } else { setIndex(prev => prev - 1); } } const [index, setIndex] = React.useState(0); React.u
const prevSplash = () => {
if (index === 1) {
setIndex(0);
} else {
setIndex(prev => prev - 1);
}
}
const [index, setIndex] = React.useState(0);
React.useEffect(() => {
const timer = setInterval(() => {
if (index === 1) {
setIndex(0);
} else {
setIndex(prev => prev + 1);
}
}, 10000);
return () => clearInterval(timer);
},);
尝试在类中的this.state中定义useState属性,并在componentDidMount中定义useEffect函数 您的代码如下所示:
import React,{Component} from 'react';
class Demo extends Component{
constructor(props){
super(props);
this.state = {
index:0
}
}
prevSplash = () => {
if (this.state.index === 1) {
this.setState({...this.state,index:0});
} else {
this.setState((prev)=>({
index:prev.index-1
}));
}
}
componentDidMount(){
const timer = setInterval(() => {
if (this.state.index === 1) {
this.setState({...this.state,index:0});
} else {
this.setState((prev)=>({
index:prev.index+1
}));
}
}, 10000);
return () => clearInterval(timer);
};
render() {
return (
<h1>
//your code
</h1>
)
}
}
}
export default Demo;
import React,{Component}来自'React';
类Demo扩展了组件{
建造师(道具){
超级(道具);
此.state={
索引:0
}
}
prevSplash=()=>{
if(this.state.index==1){
this.setState({…this.state,索引:0});
}否则{
此.setState((上一个)=>({
索引:prev.index-1
}));
}
}
componentDidMount(){
常量计时器=设置间隔(()=>{
if(this.state.index==1){
this.setState({…this.state,索引:0});
}否则{
此.setState((上一个)=>({
指数:上一指数+1
}));
}
}, 10000);
返回()=>clearInterval(计时器);
};
render(){
返回(
//你的代码
)
}
}
}
导出默认演示;
到目前为止,您尝试了什么?