彙總mobx奇淫技巧

簡化action屬性更新

一般狀況下，store中會有不少屬性，其中有些屬性更新會很頻繁，每個屬性都須要寫一個action函數去更新，當這種須要變動的屬性越多時，會致使store中代碼量異常的龐大，可讀性也會下降。就以下面代碼同樣：

class TestStore {
  @observable info = {} as IInfo;
  
  @observable list = [] as IList;
  
  @action
  setInfo = (value: IInfo) => {
    this.info = value;
  }
  
  @action
  setList = (value: IList) => {
    this.list = value;
  }
}

引入typescript中keyof關鍵字使用，能夠將上述action函數簡化以下：

class TestStore {
  @observable info = {} as IInfo;
  
  @observable list = [] as IList;
  
  @action
  setValue = <T extends keyof TestStore>(key: T, value: this[T]) => {
    this[key] = value;
  }
}