如何在Redux中设置初始状态

Question

我试图弄清楚如何为redux中的商店设置初始状态。我以https://github.com/reactjs/redux/blob/master/examples/todos-
with-
undo/reducers/index.js

为例。我试图修改代码，以便待办事项已初始化一个值。

const todoApp = combineReducers({
  todos,
  visibilityFilter
}, {
  todos: [{id:123, text:'hello', completed: false}]
})

按照文档操作：http :
//redux.js.org/docs/api/createStore.html

但它不起作用，我不太确定为什么。

Answer 1

它必须是第二个参数createStore：

const rootReducer = combineReducers({
  todos: todos,
  visibilityFilter: visibilityFilter
});

const initialState = { 
  todos: [{id:123, text:'hello', completed: false}] 
};

const store = createStore(
  rootReducer, 
  initialState
);