有没有办法在不使用道具的情况下更新反应组件？

Question

I want to update a react component from another component not connected to each other via props. How can i?

Answer 1

You'd have to use state somewhere above the level of both of the components. Then you have to have a method to change that state which then passes the data down via props.

Edit: So, you need to have some sort of state management, either by hooks context or some other state management, like redux, mobx, etc. For quick and dirty, use useContext.

Answer 2

If you use classes you can do:

this.forceUpdate();

Answer 3

You can pass key as props and give it an updated value in that.

but, theres a catch. When key updates, react will recreate that component in the component tree, ie, it will unmount and remount

<Component key={some-value-that-updates}/>