这些错误阻止了我的 nodejs 应用程序加载

Question

我在渲染页面时收到这些错误。 我的项目基于 NodeJs + React。

我正在使用这些版本。 反应版本：^16.5 反应圆顶：^16.5 @material-ui/core：^4.9.1 @material-ui/icons：^4.9.1"

第一个错误：

Tooltip.js:479 Uncaught TypeError: Cannot read property 'className' of undefined
at Tooltip (Tooltip.js:479)
at renderWithHooks (react-dom.development.js:14803)
at updateForwardRef (react-dom.development.js:16816)
at beginWork (react-dom.development.js:18645)
at HTMLUnknownElement.callCallback (react-dom.development.js:188)
at Object.invokeGuardedCallbackDev (react-dom.development.js:237)
at invokeGuardedCallback (react-dom.development.js:292)
at beginWork$1 (react-dom.development.js:23203)
at performUnitOfWork (react-dom.development.js:22157)
at workLoopSync (react-dom.development.js:22130)

第二个错误：

The above error occurred in the <ForwardRef(Tooltip)> component:
in ForwardRef(Tooltip) (created by WithStyles(ForwardRef(Tooltip)))
in WithStyles(ForwardRef(Tooltip)) (created by Block)
in div (created by Block)
in Block (created by BlockAnimation)
in div (created by PoseElement)
in PoseElement (created by Context.Consumer)
in Unknown (created by BlockAnimation)
in Transition (created by PoseGroup)
in PoseGroup (created by BlockAnimation)
in div (created by BlockAnimation)
in BlockAnimation (created by Route)
in Route (created by withRouter(BlockAnimation))
in withRouter(BlockAnimation) (created by Navigation)
in div (created by Navigation)
in div (created by Navigation)
in div (created by ForwardRef(Toolbar))
in ForwardRef(Toolbar) (created by WithStyles(ForwardRef(Toolbar)))
in WithStyles(ForwardRef(Toolbar)) (created by Navigation)
in header (created by ForwardRef(Paper))
in ForwardRef(Paper) (created by WithStyles(ForwardRef(Paper)))
in WithStyles(ForwardRef(Paper)) (created by ForwardRef(AppBar))
in ForwardRef(AppBar) (created by WithStyles(ForwardRef(AppBar)))
in WithStyles(ForwardRef(AppBar)) (created by Navigation)
in div (created by Navigation)
in Navigation (created by Connect(Navigation))
in Connect(Navigation) (created by Route)
in Route (created by withRouter(Connect(Navigation)))
in withRouter(Connect(Navigation)) (created by ReduxWrapper)
in div (created by ReduxWrapper)
in ReduxWrapper (created by Connect(ReduxWrapper))
in Connect(ReduxWrapper) (created by Root)
in div (created by Root)
in Root (created by Route)
in Route
in div
in Router (created by ConnectedRouter)
in ConnectedRouter
in Provider
in AppContainer

我无法弄清楚这是什么意思。

错误被抛出到这个页面。

使用这样的工具提示：

    import React, { Component } from 'react';
    import Tooltip from '@material-ui/core/Tooltip';
    import styles from './styles.css';
    
    class Block extends Component
    {
            state = {tooltipOpen:false};
    
        open = () => {
            this.setState({
                tooltipOpen: true
            });
        }
    
        close = () => {
            this.setState({
                tooltipOpen: false
            });
        }
    
        render ()
        {
            const {
                state: { tooltipOpen },
                props:{num}
            } = this;
            return (
                <div>
                    <div id={`block${num}`} className={`${styles['bar']} d-inline-flex`} onClick={(i)=>this.props.onClick({num})}></div>
                    <Tooltip title={`block${num}`} placement="bottom" open={tooltipOpen} onOpen={this.open}
                        onClose={this.close}
                        enterDelay={250}>
                        {`Block: ${num}`}
                    </Tooltip>
                </div>
            );
        }
    }
    
    export default Block;

Answer 1

在 material-ui github https://github.com/mui-org/material-ui/issues/18119上查看此问题

您正在使用 material-ui 的 Tooltip 并且他的孩子必须是一个元素，当您使用： {`Block: ${num}`}时是错误的。 尝试使用它，就像这样： <span>{`Block: ${num}`}</ span>

它必须是一个元素，以便 material-ui 可以从中传递 ref。 如果您查看theis docs，您将看到它必须是一个元素https://material-ui.com/pt/api/tooltip/