如何在redux中设置初始状态

问题描述

我想弄清楚如何在 redux 中为商店设置初始状态.我正在使用 https://github.com/reactjs/redux/blob/master/examples/todos-with-undo/reducers/index.js 为例.我尝试修改代码，使待办事项初始化了一个值.

I'm trying to figure out how to set an initial state for a store in redux. I'm using https://github.com/reactjs/redux/blob/master/examples/todos-with-undo/reducers/index.js as an example. I tried to modify the code such that the todos had a value initialized.

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

遵循文档:http://redux.js.org/docs/api/createStore.html

但它不起作用，我不太确定为什么.

but it's not working, and I'm not quite sure why.

推荐答案

它需要是 createStore 的第二个参数:

It needs to be the second argument to createStore:

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

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

const store = createStore(
  rootReducer,
  initialState
);

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