javascript - 设置状态(...): Can only update a mounted or mounting component even if component is mounted

Question

我正在使用React最新版本，当单击运行expandMenu()的按钮时，我收到以下错误

这里跟踪生命周期:

constructor
componentWillMount
render
componentDidMount
componentWillReceiveProps
render
componentWillReceiveProps
render
componentWillReceiveProps
render
expandMenu <<< click on the button - boom error!

据我所知，该组件是在运行expandMenu()时安装的，这使得错误不明确。什么可能导致该问题以及如何解决它？

setState(...): Can only update a mounted or mounting component. This usually means you called setState() on an unmounted

export class Menu extends React.Component<Props, State> {
  constructor(props: Props) {
    super(props)
    this.state = {
	showPath: true,
	selectedItemIdx: 1,
    }
  }

  componentWillReceiveProps(nextProps: Props) {
    const { items } = nextProps
    this.setState({
      selectedItemIdx: items.length - 1,
    })
  }

  componentWillMount() {
    console.debug('componentWillMount')
  }

  componentDidMount() {
    console.debug('componentDidMount')
  }

  componentWillUnmount() {
    console.debug('componentWillUnmount')
  }

  expandMenu = () => {
    console.debug('expandMenu')
    const { items } = this.props
    if (items.length > 1) {
      this.setState({ showPath: true }) // error here
    }
  }

  itemClickHandler = (idx: number) => {
      this.expandMenu()
  }

  render() {
    console.debug('render')
    const { classes } = this.props
    return (
          <div className={classes.root}>
                <ButtonBase
                  className={classes.title}
                  onClick={() => {
                    this.itemClickHandler(idx)
                  }}
                >
              ))}
        
          </div>
    )
  }
}

Answer 1

问题与 react-hot-loader 有关，我必须将其从我的项目依赖项中删除。