(react.js)why React Cannot Find The Object?

I am a newbie learning to build a rpg game with React.js, and I found this part very confusing. I am trying to update life with onClick and when life

Solution 1:

I know what i am wrong:

when I am dropping a object, I should move the index back:

if (life>damage){
        players[index2].life = life-damage;}
    else {players=players.filter(player => player.id !== id2);
          this.setState({playerindex:this.state.playerindex-1});}

This problem is solved, however please give me advice on this project if you like!

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