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xiaohuoni
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Jul 28, 2020
| export default () => { | ||
| const [list, setList] = useState([]); | ||
| // list需要定义是什么类型的，这里给定Array | ||
| const [list, setList] = useState(Array); |
| console.log(data); | ||
| console.log(list); | ||
| setList(list); | ||
| // 解构（list是引用类型，改变其中的值不会导致重新渲染（因为地址值不会改变），这里的myList不属于引用类型） |
| { | ||
| list.map(item => <p>{item.state}</p>) | ||
| // 增加key值 | ||
| list.map((item, index) => <p key={index}>{item.state}</p>) |
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不要用index作为key。
自己查一查 react 中的 key 有什么作用
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