React里修改state的两种方式

 constructor(props) {
    super(props)
    this.state = {
      name: '',
      age: 24,
      exp: {
        year: '',
        job: 'web前端'
      }
    }
  };
   componentDidMount() {
    this.setState({
      name: '张三'，
    })
    this.setState({
      age: 26，
    })
  };

setTime() {
  setTimeout(() => {
    this.setState({
      name: '李四'
    })
  }, 2000)
  // Correct
  this.setState((state, props) => ({
    age: state.age + 3
  }));
};