怎么我的時(shí)間不變化，定時(shí)器沒(méi)作用
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怎么我的時(shí)間不變化，定時(shí)器沒(méi)作用
qq_嶸歸_0
2018-10-09
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2018-10-10
拼寫(xiě)錯(cuò)誤 componentDidMont 應(yīng)該是 componentDidMount， 下次注意歐
2018-10-09
代碼貼來(lái)看看
2018-10-09
import React, { Component } from 'react';
import Clock from './Clock';
class App extends Component {
render() {
return (
<div>
<Clock />
</div>
);
}
}
export default App;
2018-10-09
import React from 'react';
class Clock extends React.Component{
constructor(props){
super(props);
this.state={
date:new Date()
}
}
componentDidMont(){
this.timer=setInterval( ()=>{
this.setState({
date: new Date()
})
}, 1000)
}
componentDidUpdate(currentProps,currentState){
console.log(currentState)
}
componentWillUnmount(){
clearInterval(this.timer)
}
render(){
return(
<h1>{this.state.date.toLocaleTimeString()}</h1>
)
}
?}
?export default Clock;
2018-10-09
hao