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atomu's Introduction

atomu

npm version npm downloads npm license

一个轻量级微信小程序状态管理库。

安装

通过 npm:

npm install atomu

用例

创建 store

const { createStore } = require('atomu');

const store = createStore({
  state: {
    count: 0,
  },

  actions: {
    increment({ set, get }) {
      set({ count: get().count });
    },
  },
});

组件中使用

在逻辑层中,绑定 store:

Component({
  lifetimes: {
    attached() {
      this.$store = store.bind(this, ['count'], '$store');
    },

    detached() {
      this.$store.unbind();
    },
  },

  methods: {
    increment() {
      this.$store.dispatch('increment');
    },
  },
});

完成绑定后,可以在视图层中轻松访问并使用 store 中存储的状态:

<button wx:bind="increment">count: {{ $store.count }}</button>

TIP: 组件销毁后,请务必手动进行解绑操作,以避免潜在的内存泄漏问题。

携带载荷

actions 可以接收 dispatch 方法传递的载荷,从而灵活处理各种业务逻辑:

actions: {
  increment({ set, get }, payload) {
    set({ count: payload });
  }
}

store.dispatch('increment', 0)

异步提交更新

actions 支持异步操作:

actions: {
  async increment({ set, get }) {
    // await ...
    set({ count: get().count });
  }
}

调用 dispatch 方法时,会返回一个 Promise 实例,能够方便地判断异步 action 的执行状态:

store
  .dispatch('increment')
  .then(() => {
    // ...
  })
  .catch(() => {
    // ...
  });

订阅状态更新

Component({
  lifetimes: {
    attached() {
      this.unsubscribe = store.subscribe((mutation, state) => {
        console.log(mutation, state);
      });
    },

    detached() {
      this.unsubscribe();
    },
  },
});

绑定多个 store

Component({
  lifetimes: {
    attached() {
      this.$store = store.bind(this, ['count'], '$store');
      this.$user = user.bind(this, ['profile'], '$user');
    },

    detached() {
      this.$store.unbind();
      this.$user.unbind();
    },
  },
});

API

bind

  • bind(ctx: Component | Page, stateKeys?: string[], namespace?: string)

bind 方法用于将 store 中的状态绑定到组件中,通过 stateKeys 参数,可以指定需要绑定的具体状态(若未指定,则默认绑定 store 中的所有状态)。而 namespace 则用于为绑定的状态创建一个独立的空间,确保在状态更新时仅更新该空间内的状态,这在同时绑定多个 store 时尤为实用,有助于避免状态之间的混淆和冲突。

bind 方法所绑定的状态都会自动存储在组件的 data 对象中,方便在组件内部直接使用这些状态数据:

Component({
  lifetimes: {
    attached() {
      this.$store = store.bind(this, ['count'], '$store');
    },

    detached() {
      this.$store.unbind();
    },
  },

  methods: {
    increment() {
      // 访问状态
      this.$store.dispatch('increment', this.data.$store.count);
    },
  },
});

getState

  • getState()

getState 方法用于在组件外部获取状态:

store.getState();

插件

Logger

日志插件用于一般的调试:

const { createLogger } = require('atomu');

const store = createStore({
  plugins: [createLogger()],
});

createLogger 函数有几个配置项:

createLogger({
  collapsed: false, // 自动展开记录的 mutation
  filter(mutation, state) {
    // 若 mutation 需要被记录,就让它返回 true 即可
    // `mutation` 的格式是 `{ type, payload }`
    return mutation.type !== 'ignore';
  },
  logger: console, // 自定义 console 实现,默认为 `console`
});

Persisted State

持久化插件用于本地缓存 store 中的状态:

const { createPersistedState } = require('atomu');

const store = createStore({
  plugins: [createPersistedState()],
});

createPersistedState 函数有几个配置项:

createPersistedState({
  key: 'atomu', // 本地缓存中指定的 key
  filter(mutation, state) {
    // 若 mutation 需要被记录,就让它返回 true 即可
    // `mutation` 的格式是 `{ type, payload }`
    return mutation.type !== 'ignore';
  },
});

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