创建应用程序的初始状态

1import { writable, get } from 'svelte/store';
2
3const localState = localStorage.getItem('state');
4const initialState = {
5  students: []
6};
7
8if (!localState) {
9  localStorage.setItem('state', JSON.stringify(initialState));
10}
11
12const appState = localState ? JSON.parse(localState) : initialState;
13
14export const state = writable(appState);
15export const update = callback => {
16  const updatedState = callback(get(state));
17
18  state.update(() => updatedState);
19  localStorage.setItem('state', JSON.stringify(updatedState));
20};