出现这个问题通常是因为没有正确导入Apollo客户端。以下是一个正确导入的示例：

import { ApolloClient, InMemoryCache, HttpLink } from '@apollo/client'; import { WebSocketLink } from '@apollo/client/link/ws';

const httpLink = new HttpLink({ uri: '/graphql' }); const wsLink = new WebSocketLink({ uri: ws://${window.location.host}/graphql, options: { reconnect: true } }); const splitLink = split(({ query }) => { const definition = getMainDefinition(query); return definition.kind === 'OperationDefinition' && definition.operation === 'subscription'; }, wsLink, httpLink); const client = new ApolloClient({ link: splitLink, cache: new InMemoryCache() });

确保正确导入及实例化Apollo客户端后，重新运行应用程序即可解决TypeError: value.subscribe不是一个函数的问题。