React：当只有子组件需要重新渲染时，如何防止父组件重新渲染 onmousemove 状态更改？

Question

A parent component updates x,y properties in state onmousemove, these are then passed via props to a child component. Currently both the parent and the chid re-renders onmousemove; is there a way to prevent the re-render on the parent so that only the child re-renders? Example: The parent is the bounding area, the child is a custom cursor.

Answer 1

保持子组件本地的 state(x,y coords)。