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Which is better to use three definitions of variables in React ES6? Why? #11839

@xiubug

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@xiubug
// One
const arr = [7,8,9]; 
class WatchStore extends Component {
  constructor(props) {
     super(props);
   }
   ......
}

// Two
class WatchStore extends Component {
  constructor(props) {
     super(props);
     this.state = {
       arr: [7,8,9],
     }
   }
   ......
}

// Three
class WatchStore extends Component {
  constructor(props) {
     super(props);
   }
   componentDidMount() {
     this.arr = [7,8,9]; 
   }
   ......
}

which is the best way to use the three defined methods?
The arr does not need to be rendered, just make a temporary cache comparison new data use!

Thanks!

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