React Query

React Query 是个 React 中通用的请求库

例子

import { QueryClient, QueryClientProvider, useQuery } from 'react-query'

 const queryClient = new QueryClient()

 export default function App() {
   return (
     <QueryClientProvider client={queryClient}>
       <Example />
     </QueryClientProvider>
   )
 }

 function Example() {
   const { isLoading, error, data } = useQuery('repoData', () =>
     fetch('https://api.github.com/repos/tannerlinsley/react-query').then(res =>
       res.json()
     )
   )

   if (isLoading) return 'Loading...'

   if (error) return 'An error has occurred: ' + error.message

   return (
     <div>
       <h1>{data.name}</h1>
       <p>{data.description}</p>
       <strong>👀 {data.subscribers_count}</strong>{' '}
       <strong>✨ {data.stargazers_count}</strong>{' '}
       <strong>🍴 {data.forks_count}</strong>
     </div>
   )
 }

三个核心概念

• 请求
• 变更
• 请求失效

 import {
   useQuery,
   useMutation,
   useQueryClient,
   QueryClient,
   QueryClientProvider,
 } from 'react-query'
 import { getTodos, postTodo } from '../my-api'

 // Create a client
 const queryClient = new QueryClient()

 function App() {
   return (
     // Provide the client to your App
     <QueryClientProvider client={queryClient}>
       <Todos />
     </QueryClientProvider>
   )
 }

 function Todos() {
   // Access the client
   const queryClient = useQueryClient()

   // Queries
   const query = useQuery('todos', getTodos)

   // Mutations
   const mutation = useMutation(postTodo, {
     onSuccess: () => {
       // Invalidate and refetch
       queryClient.invalidateQueries('todos')
     },
   })

   return (
     <div>
       <ul>
         {query.data.map(todo => (
           <li key={todo.id}>{todo.title}</li>
         ))}
       </ul>

       <button
         onClick={() => {
           mutation.mutate({
             id: Date.now(),
             title: 'Do Laundry',
           })
         }}
       >
         Add Todo
       </button>
     </div>
   )
 }

 render(<App />, document.getElementById('root'))

参考

• https://react-query.tanstack.com/overview