I am loading a child component on parent component in React.js. With a click on the button, data will be pass to child component through props, and child component will map through that data and render on screen. I am getting data from localstorage and pro...

如果使用索引作为键，则无法使其无法正常工作。唯一的方法是，如果我更改数组并使用index作为键。但是由于规则不是要改变状态（数组），所以如果是这种情况，我就不能使其正常工作，这与文档中所说的相反。我如何证明它可能会破裂？ function App() { const [arr, setArr] = React.useState(["A","B","C"]); function toggleSortOrder() { let newArr = [...arr]; newArr.r...