如何利用React和GraphQL构建灵活的前后端数据交互

npm install react react-dom react-apollo graphql apollo-boost

import React from 'react';
import { ApolloProvider } from 'react-apollo';
import ApolloClient from 'apollo-boost';

const client = new ApolloClient({
  uri: 'http://localhost:4000/graphql' // GraphQL服务器的URL
});

ReactDOM.render(
  <ApolloProvider client={client}>
    <App />
  </ApolloProvider>,
  document.getElementById('root')
);

import React from 'react';
import { Query } from 'react-apollo';
import gql from 'graphql-tag';

const GET_USER = gql`
  query GetUser($id: ID!) {
    user(id: $id) {
      id
      name
      email
    }
  }
`;

const User = ({ id }) => (
  <Query query={GET_USER} variables={{ id }}>
    {({ loading, error, data }) => {
      if (loading) return <p>Loading...</p>;
      if (error) return <p>Error :(</p>;

      const { user } = data;

      return (
        <div>
          <p>Name: {user.name}</p>
          <p>Email: {user.email}</p>
        </div>
      );
    }}
  </Query>
);

import React from 'react';
import { Mutation } from 'react-apollo';
import gql from 'graphql-tag';

const CREATE_USER = gql`
  mutation CreateUser($input: CreateUserInput!) {
    createUser(input: $input) {
      id
      name
      email
    }
  }
`;

const CreateUser = () => (
  <Mutation mutation={CREATE_USER}>
    {(createUser, { data }) => (
      <div>
        <button onClick={() => {
          createUser({ variables: { input: { name: 'John', email: 'john@example.com' } } })
        }}>Create User</button>
      </div>
    )}
  </Mutation>
);