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[英]React Warning: Can't perform a React state update on an unmounted component. To fix, cancel all subscriptions
[英]React: SetInterval in ComponentDidMount causing error "Warning: Can't perform a React state update on an unmounted component."
我想為我的 React 應用程序中的組件添加打字效果,我正在使用setInterval
來做到這一點。 一切正常,但我收到以下錯誤:
Warning: Can't perform a React state update on an unmounted component.
This is a no-op, but it indicates a memory leak in your application.
To fix, cancel all subscriptions and asynchronous tasks in the componentWillUnmount method
該函數從componentDidMount()
開始,所以我不明白為什么它說我正在更新一個未安裝的組件。 我嘗試在componentWillUnmount()
添加clearInterval()
componentWillUnmount()
但錯誤仍然顯示。
代碼:
componentDidMount = () => {
this.typeText();
}
componentWillUnmount(){
console.log(this.state.intervalId);
clearInterval(this.state.intervalId);
}
typeText = () => {
const sp = (text,key) => <span key={key} style={{whiteSpace: 'pre-line'}}>{text}</span>;
const results = this.state.screenText;
let start = 0;
let cursor = 0;
const intervalId = setInterval(() => {
if (results.length) results.pop();
const str = this.state.text.slice(start,cursor);
const span = sp(str,cursor);
results.push(span);
this.setState({screenText:results});
start = Math.floor((cursor / 80));
cursor += 1;
if (cursor > this.state.text.length) clearInterval(intervalId);
},5);
this.setState({intervalId: intervalId});
console.log(this.state.intervalId);
}
render() {
return <span id="typing"> {this.state.screenText}</span>
}
我認為您的代碼的問題在於您將intervalId
保存在組件的狀態中。
您可能知道,當您調用setState
它會導致rerender
。
您可以將您的intervalId
保存在類的屬性中。
請考慮您的代碼中的這些更改:
class MyClsss extends React.component{ intervalId = ""; ... }
this.intervalId = setInterval(...)
clearInterval(this.intervalId);
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