React下获取width和height

利用ref保存DOM节点，然后读取clientWidth,clientHeight获取宽高参数。

import React, { Component } from 'react';
import 'assets/css/App.css'


export class App extends Component {


  constructor(props) {
    super(props);

    this.saveRef = ref => {this.refDom = ref};
    this.handleClick = this.handleClick.bind(this);
  }

  handleClick(e) {
    const {clientWidth, clientHeight} = this.refDom;
    console.log('====================================');
    console.log(clientWidth, clientHeight, this.refDom);
    console.log('====================================');
  }

  render() {

    return (
      <div ref={this.saveRef} onClick={this.handleClick} > Loading...</div>
    );
  }
}

export default App;