webpackbin 演示
假设您的状态看起来像这样
entities: {
words: {
//...
1: {
id:1,
text:"Word",
definitions: [1, 2, 3]
},
// other word objects...
},
definitions: {
1: {id:1, text:'blah blah'},
2: {id:2, text:'blah blah'},
3: {id:3, text:'blah blah'},
// definition objects
}
},
wordsById : [1,4,7,8,22]
那么... WordList 可能看起来像这样。从状态中切片单词的 id,以呈现列表
const WordList = ({ids}) => <div>{ids.map(id => <Word id={id} key={id}/>)}</div>;
export default connect(state =>({ ids:state.wordsById }))(WordList);
和 Word 组件:通过 props 中的 id 从 state 中获取特定的单词,通过 map 计算定义列表
const Word = ({word, definitions}) =>(
<div className="word-block">
<span>{word.text}</span>
<DefinitionsList definitions={definitions}/>
</div>
)
const mapStateToProps = (state, props) =>{
const word = state.entities.words[props.id];
const { definitions:ids } = word
return {
word,
definitions:ids.map(id => state.entities.definitions[id])
};
}
export default connect(mapStateToProps, actions)(Word);
和定义列表
const DefinitionsList = ({definitions})=> (
<div className="definitions">
{definitions.map(def =><div key={def.id}>{def.text}</div>)}
</div>
);
功能组件只是简称。