添加这个是为了多样性和干净的方法。

此代码使用函数式方法。我已经使用onresize而不是addEventListener，如在其他答案中提到的。

import { useState, useEffect } from "react";

export default function App() {
  const [size, setSize] = useState({
    x: window.innerWidth,
    y: window.innerHeight
  });
  const updateSize = () =>
    setSize({
      x: window.innerWidth,
      y: window.innerHeight
    });
  useEffect(() => (window.onresize = updateSize), []);
  return (
    <>
      <p>width is : {size.x}</p>
      <p>height is : {size.y}</p>
    </>
  );
}

使用钩子(React 16.8.0+)

创建一个useWindowDimensions钩子。

import { useState, useEffect } from 'react';

function getWindowDimensions() {
  const { innerWidth: width, innerHeight: height } = window;
  return {
    width,
    height
  };
}

export default function useWindowDimensions() {
  const [windowDimensions, setWindowDimensions] = useState(getWindowDimensions());

  useEffect(() => {
    function handleResize() {
      setWindowDimensions(getWindowDimensions());
    }

    window.addEventListener('resize', handleResize);
    return () => window.removeEventListener('resize', handleResize);
  }, []);

  return windowDimensions;
}

之后你就可以像这样在元件中使用它了

const Component = () => {
  const { height, width } = useWindowDimensions();

  return (
    <div>
      width: {width} ~ height: {height}
    </div>
  );
}

工作示例

原来的答案

在React中也是一样的，你可以使用window。innerHeight来获取当前视口的高度。

正如你在这里看到的

用一点打字稿

import { useState, useEffect } from 'react'; interface WindowDimentions { width: number; height: number; } function getWindowDimensions(): WindowDimentions { const { innerWidth: width, innerHeight: height } = window; return { width, height }; } export default function useWindowDimensions(): WindowDimentions { const [windowDimensions, setWindowDimensions] = useState<WindowDimentions>( getWindowDimensions() ); useEffect(() => { function handleResize(): void { setWindowDimensions(getWindowDimensions()); } window.addEventListener('resize', handleResize); return (): void => window.removeEventListener('resize', handleResize); }, []); return windowDimensions; }

有一个包有93.000+下载，名为useWindowSize()

NPM I @react-hook/window-size

import {
  useWindowSize,
  useWindowWidth,
  useWindowHeight,
} from '@react-hook/window-size'

const Component = (props) => {
  const [width, height] = useWindowSize()
  const onlyWidth = useWindowWidth()
  const onlyHeight = useWindowHeight()
...
}

docs

class AppComponent extends React.Component {

  constructor(props) {
    super(props);
    this.state = {height: props.height};
  }

  componentWillMount(){
    this.setState({height: window.innerHeight + 'px'});
  }

  render() {
    // render your component...
  }
}

设置道具

AppComponent.propTypes = {
 height:React.PropTypes.string
};

AppComponent.defaultProps = {
 height:'500px'
};

视口高度现在可用{this.state。渲染模板中的Height}

通过在useCallback中包装getWindowDimensions函数，我对代码进行了轻微的更新

import { useCallback, useLayoutEffect, useState } from 'react';

export default function useWindowDimensions() {

    const hasWindow = typeof window !== 'undefined';

    const getWindowDimensions = useCallback(() => {
        const windowWidth = hasWindow ? window.innerWidth : null;
        const windowHeight = hasWindow ? window.innerHeight : null;

        return {
            windowWidth,
            windowHeight,
        };
    }, [hasWindow]);

    const [windowDimensions, setWindowDimensions] = useState(getWindowDimensions());

    useLayoutEffect(() => {
        if (hasWindow) {
            function handleResize() {
                setWindowDimensions(getWindowDimensions());
            }

            window.addEventListener('resize', handleResize);
            return () => window.removeEventListener('resize', handleResize);
        }
    }, [getWindowDimensions, hasWindow]);

    return windowDimensions;
}