如何在react js中获取url的主机名

const hostname = window.location.hostname;
console.log(hostname); // 输出当前页面的主机名

import React, { Component } from 'react';

class MyComponent extends Component {
  constructor(props) {
    super(props);
    this.state = {
      hostname: ''
    };
  }

  componentDidMount() {
    const hostname = window.location.hostname;
    this.setState({ hostname });
  }

  render() {
    return (
      <div>
        <p>当前页面的主机名：{this.state.hostname}</p>
      </div>
    );
  }
}

export default MyComponent;