Question

你可以装饰你的类组件，这与将组件传递到函数中是一样的。 装饰器是修改组件功能灵活且易读的方式。

@setTitle('Profile')
class Profile extends React.Component {
  //....
}

/*
title is a string that will be set as a document title
WrappedComponent is what our decorator will receive when
put directly above a component class as seen in the example above
*/
const setTitle = (title) => (WrappedComponent) => {
return class extends React.Component {
  componentDidMount() {
    document.title = title
  }

  render() {
    return <WrappedComponent {...this.props} />
  }
}
}