1. Lodash's FindIndex method can never return undefined2. React component is indeed rendered, that is to say, teamdata [targetindex]. Score has been added
Why is targetitem undefined? Is it a chrome bug?
This problem also occurs when debugging Vue single page applications
The browser won't have this bug, only the code will. Check it out
Can I help you?? I have, too.. Sometimes watch this, one is vuecomponent, the other is window