但是课程太2018年了

ScrollToTop实现与React挂钩

ScrollToTop.js

import { useEffect } from 'react';
import { withRouter } from 'react-router-dom';

function ScrollToTop({ history }) {
  useEffect(() => {
    const unlisten = history.listen(() => {
      window.scrollTo(0, 0);
    });
    return () => {
      unlisten();
    }
  }, []);

  return (null);
}

export default withRouter(ScrollToTop);

用法:

<Router>
  <Fragment>
    <ScrollToTop />
    <Switch>
        <Route path="/" exact component={Home} />
    </Switch>
  </Fragment>
</Router>

ScrollToTop也可以实现为一个包装器组件:

ScrollToTop.js

import React, { useEffect, Fragment } from 'react';
import { withRouter } from 'react-router-dom';

function ScrollToTop({ history, children }) {
  useEffect(() => {
    const unlisten = history.listen(() => {
      window.scrollTo(0, 0);
    });
    return () => {
      unlisten();
    }
  }, []);

  return <Fragment>{children}</Fragment>;
}

export default withRouter(ScrollToTop);

用法:

<Router>
  <ScrollToTop>
    <Switch>
        <Route path="/" exact component={Home} />
    </Switch>
  </ScrollToTop>
</Router>

利用钩子，你可以简单地在代码库的useEffect中插入window.scrollTo(0,0)。简单地在你的应用程序中实现代码片段，它应该在它的窗口顶部加载每个页面。

import { useEffect } from 'react';

useEffect(() => {
   window.scrollTo(0, 0);
}, []);

对于react-router-dom V5，滚动到顶部

    import React, { useEffect } from 'react';
import {
    BrowserRouter as Router,
    Switch,
    Route,
    Link,
    useLocation,
    withRouter
} from 'react-router-dom'
function _ScrollToTop(props) {
    const { pathname } = useLocation();
    useEffect(() => {
        window.scrollTo(0, 0);
    }, [pathname]);
    return props.children
}
const ScrollToTop = withRouter(_ScrollToTop)
function App() {
    return (
        <div>
            <Router>
                <ScrollToTop>
                    <Header />
                     <Content />
                    <Footer />
                </ScrollToTop>
            </Router>
        </div>
    )
}

我唯一的解决方案是在每个文件中添加一行代码，例如:

import React from 'react';
const file = () => { document.body.scrollTop = 0; return( <div></div> ) }

平滑滚动选项

import { useEffect } from 'react';
import { useLocation } from 'react-router-dom';

export default function ScrollToTop() {
  const { pathname } = useLocation();

  useEffect(() => {
    window.scrollTo({
      top: 0,
      left: 0,
      behavior: 'smooth', 
    });
  }, [pathname]);

  return null;
}

...

<Router>
      <ScrollToTop />
     ...
    </Router>

我发现ReactDOM.findDomNode(this). scrollintoview()正在工作。我把它放在componentDidMount()中。