Reactjs Redux 工具包不更新状态

即使我成功地从API获取帖子并使用Dispatcher将响应保存到状态.该州没有更新.在Feed中，它显示没有找到Posts，但在posts.js(第11行)中，它使用Posts数组控制台记录状态

Feed.js个

export default function Feed() {

  const dispatch = useDispatch();
  useEffect(()=>{
    const postsFetch = async () => {
      const res = await fetch("/api/posts?author&likes",{
        headers:{
          "authorization": "Bearer "+user.token,
          "Content-Type":"application/json",
        }
      })
      const data = await res.json();
      dispatch(postActions.setPosts(data))
    }
    postsFetch();
  },[])
  const contextPosts = useSelector(s=>s.posts)
  const user = useSelector(s=>s.user)
  console.log(user)
  console.log(contextPosts)
  return (
    <div class="container pt-4 pb-4">
      {contextPosts.length == 0 && <h5 className="text-muted">No posts found</h5> }
      {contextPosts.map(d=>(
      <Post data={d} />
      ))}
    </div>
  );
}

posts.js | posts slice个

import { createSlice } from "@reduxjs/toolkit";

let initialState = []

export const postsSlice = createSlice({
  name: "posts",
  initialState,
  reducers: {
    setPosts: (state, action) => {
      state = action.payload;
      console.log(state)
    },
  },
});

// Action creators are generated for each case reducer function
export const postActions = postsSlice.actions;

export default postsSlice.reducer;