判断是否登录

const { hotReducer, userReducer } = this.props;

    if (!userReducer.user._id) {
      return (
        <Modal
          animationType={'none'}
          transparent={true}
          visible={true}
          onRequestClose={() => this._setModalVisible(false)}
          >
          <LoginContainer {...this.props}/>
        </Modal>
      );
    }