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我剛剛開始學習reactjs & redux並嘗試將項目添加到列表中。這是我的rootcomponent:如何讓減速機工作?
//create store based on reducer
const store = createStore(listItem)
const rootEl = document.getElementById('root')
//render root component
const render =() => ReactDOM.render(
<List
addToList={() => store.dispatch({ type: 'ADD_TO_LISTS' },'testing')}
/>,
rootEl
)
//call
render()
//subscribe the store
store.subscribe(render)
在列表組件的渲染方法是這樣的:
render() {
const { addToList } = this.props
return (
<p>
<input type="text" />
<button onClick={addToList}>add</button>
</p>
)
}
減速機看起來是這樣的:
const listItem = (state, action) => {
switch (action.type) {
case 'ADD_TO_LIST':
return [...state,action.text]
default:
return state
}
}
然而,當我運行程序的時候,引發錯誤:
Uncaught error: expected reducer to be a function
我的代碼有什麼問題?