编辑：随着v16.8.0中 react-hooks 的引入，您可以通过使用useContexthook在功能组件中使用上下文

const Users = () => {
    const contextValue = useContext(UserContext);
    // rest logic here
}

编辑：从16.6.0版开始。您可以使用this.context类似的生命周期方法中的上下文

class Users extends React.Component {
  componentDidMount() {
    let value = this.context;
    /* perform a side-effect at mount using the value of UserContext */
  }
  componentDidUpdate() {
    let value = this.context;
    /* ... */
  }
  componentWillUnmount() {
    let value = this.context;
    /* ... */
  }
  render() {
    let value = this.context;
    /* render something based on the value of UserContext */
  }
}
Users.contextType = UserContext; // This part is important to access context values

在 16.6.0 版本之前，您可以通过以下方式进行

为了在你的生命周期方法中使用 Context，你可以像这样编写你的组件

class Users extends React.Component {
  componentDidMount(){
    this.props.getUsers();
  }

  render(){
    const { users } = this.props;
    return(

            <h1>Users</h1>
            <ul>
              {users.map(user) => (
                <li>{user.name}</li>
              )}
            </ul>
    )
  }
}
export default props => ( <UserContext.Consumer>
        {({users, getUsers}) => {
           return <Users {...props} users={users} getUsers={getUsers} />
        }}
      </UserContext.Consumer>
)

通常，您会在您的应用程序中维护一个上下文，并且将上述登录名打包在 HOC 中以便重用它是有意义的。你可以这样写

import UserContext from 'path/to/UserContext';

const withUserContext = Component => {
  return props => {
    return (
      <UserContext.Consumer>
        {({users, getUsers}) => {
          return <Component {...props} users={users} getUsers={getUsers} />;
        }}
      </UserContext.Consumer>
    );
  };
};

然后你可以像这样使用它

export default withUserContext(User);

好的，我找到了一种有限制的方法。使用该with-context库，我设法将所有消费者数据插入到我的组件props中。

但是，在同一个组件中插入多个消费者是很复杂的，你必须用这个库创建混合消费者，这使得代码不优雅并且没有生产力。

本库链接：https : //github.com/SunHuawei/with-context

编辑：实际上，您不需要使用提供的多上下文 api，with-context事实上，您可以使用简单的 api 并为您的每个上下文制作一个装饰器，如果您想在组件中使用多个消费者，只需在您的class之上声明尽可能多的装饰器！

就我而言，添加.bind(this)到活动中就足够了。这就是我的组件的样子。

// Stores File
class RootStore {
   //...States, etc
}
const myRootContext = React.createContext(new RootStore())
export default myRootContext;


// In Component
class MyComp extends Component {
  static contextType = myRootContext;

  doSomething() {
   console.log()
  }

  render() {
    return <button onClick={this.doSomething.bind(this)}></button>
  }
}

以下是为我工作。这是一个使用 useContext 和 useReducer 钩子的 HOC。 在这个例子中还有一种与套接字交互的方法。

我正在创建 2 个上下文（一个用于调度，一个用于状态）。您首先需要使用 SampleProvider HOC 包装一些外部组件。然后通过使用一个或多个效用函数，您可以访问状态和/或调度。该withSampleContext是不错的，因为它通过两个调度和状态。还有其他功能，例如useSampleState和useSampleDispatch可以在功能组件中使用。

这种方法允许您像往常一样对 React 组件进行编码，而无需注入任何特定于上下文的语法。

import React, { useEffect, useReducer } from 'react';
import { Client } from '@stomp/stompjs';
import * as SockJS from 'sockjs-client';

const initialState = {
  myList: [],
  myObject: {}
};

export const SampleStateContext = React.createContext(initialState);
export const SampleDispatchContext = React.createContext(null);

const ACTION_TYPE = {
  SET_MY_LIST: 'SET_MY_LIST',
  SET_MY_OBJECT: 'SET_MY_OBJECT'
};

const sampleReducer = (state, action) => {
  switch (action.type) {
    case ACTION_TYPE.SET_MY_LIST:
      return {
        ...state,
        myList: action.myList
      };
    case ACTION_TYPE.SET_MY_OBJECT:
      return {
        ...state,
        myObject: action.myObject
      };
    default: {
      throw new Error(`Unhandled action type: ${action.type}`);
    }
  }
};

/**
 * Provider wrapper that also initializes reducer and socket communication
 * @param children
 * @constructor
 */
export const SampleProvider = ({ children }: any) => {
  const [state, dispatch] = useReducer(sampleReducer, initialState);
  useEffect(() => initializeSocket(dispatch), [initializeSocket]);

  return (
    <SampleStateContext.Provider value={state}>
      <SampleDispatchContext.Provider value={dispatch}>{children}</SampleDispatchContext.Provider>
    </SampleStateContext.Provider>
  );
};

/**
 * HOC function used to wrap component with both state and dispatch contexts
 * @param Component
 */
export const withSampleContext = Component => {
  return props => {
    return (
      <SampleDispatchContext.Consumer>
        {dispatch => (
          <SampleStateContext.Consumer>
            {contexts => <Component {...props} {...contexts} dispatch={dispatch} />}
          </SampleStateContext.Consumer>
        )}
      </SampleDispatchContext.Consumer>
    );
  };
};

/**
 * Use this within a react functional component if you want state
 */
export const useSampleState = () => {
  const context = React.useContext(SampleStateContext);
  if (context === undefined) {
    throw new Error('useSampleState must be used within a SampleProvider');
  }
  return context;
};

/**
 * Use this within a react functional component if you want the dispatch
 */
export const useSampleDispatch = () => {
  const context = React.useContext(SampleDispatchContext);
  if (context === undefined) {
    throw new Error('useSampleDispatch must be used within a SampleProvider');
  }
  return context;
};

/**
 * Sample function that can be imported to set state via dispatch
 * @param dispatch
 * @param obj
 */
export const setMyObject = async (dispatch, obj) => {
  dispatch({ type: ACTION_TYPE.SET_MY_OBJECT, myObject: obj });
};

/**
 * Initialize socket and any subscribers
 * @param dispatch
 */
const initializeSocket = dispatch => {
  const client = new Client({
    brokerURL: 'ws://path-to-socket:port',
    debug: function (str) {
      console.log(str);
    },
    reconnectDelay: 5000,
    heartbeatIncoming: 4000,
    heartbeatOutgoing: 4000
  });

  // Fallback code for http(s)
  if (typeof WebSocket !== 'function') {
    client.webSocketFactory = function () {
      return new SockJS('https://path-to-socket:port');
    };
  }

  const onMessage = msg => {
    dispatch({ type: ACTION_TYPE.SET_MY_LIST, myList: JSON.parse(msg.body) });
  };

  client.onConnect = function (frame) {
    client.subscribe('/topic/someTopic', onMessage);
  };

  client.onStompError = function (frame) {
    console.log('Broker reported error: ' + frame.headers['message']);
    console.log('Additional details: ' + frame.body);
  };
  client.activate();
};

您必须在更高的父组件中传递上下文才能作为子组件中的props获得访问权限。