在React中同步测量DOM节点

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.myRef = React.createRef();
  }

  componentDidMount() {
    const node = this.myRef.current;
    // 获取DOM节点的尺寸和位置信息
    const width = node.offsetWidth;
    const height = node.offsetHeight;
    const rect = node.getBoundingClientRect();
    const top = rect.top;
    const left = rect.left;
    // 进行相应的操作
  }

  render() {
    return <div ref={this.myRef}>Hello, World!</div>;
  }
}

import React, { useRef, useEffect } from 'react';

function MyComponent() {
  const myRef = useRef(null);

  useEffect(() => {
    const node = myRef.current;
    // 获取DOM节点的尺寸和位置信息
    const width = node.offsetWidth;
    const height = node.offsetHeight;
    const rect = node.getBoundingClientRect();
    const top = rect.top;
    const left = rect.left;
    // 进行相应的操作
  }, []);

  return <div ref={myRef}>Hello, World!</div>;
}