如何使用 useState 更改子项的数据?
How to change data of children with useState?
const [blocks, setBlocks] = useState({
"time": null,
"blocks": [
{
"key": 1,
"data": "This is some data"
}
]
});
如何使用 setBlocks 将“数据”更改为“这是其他数据”?
useState的set方法不仅接受数据,还接受函数
setState(prevState => {
return {...prevState, ...updatedValues};
});
所以你可以这样写。
setBlocks(prevState => ({
...prevState,
blocks: prevState.blocks.map(v => {
return (v.key === 1)
? {...v, data: 'this is some other data'}
: v;
}),
});
const [blocks, setBlocks] = useState({
"time": null,
"blocks": [
{
"key": 1,
"data": "This is some data"
}
]
});
如何使用 setBlocks 将“数据”更改为“这是其他数据”?
useState的set方法不仅接受数据,还接受函数
setState(prevState => {
return {...prevState, ...updatedValues};
});
所以你可以这样写。
setBlocks(prevState => ({
...prevState,
blocks: prevState.blocks.map(v => {
return (v.key === 1)
? {...v, data: 'this is some other data'}
: v;
}),
});