从父组件访问子组件中的常量

// 父组件
import React from 'react';
import ChildComponent from './ChildComponent';

const ParentComponent = () => {
  const constantValue = '常量值';

  return (
    <div>
      <ChildComponent constant={constantValue} />
    </div>
  );
};

export default ParentComponent;

// 子组件
import React from 'react';

const ChildComponent = (props) => {
  const constant = props.constant;

  return (
    <div>
      <p>常量值：{constant}</p>
    </div>
  );
};

export default ChildComponent;