handleClick(value) {
   //有用到this 需要bind   this
    this.setState({
      current: value,
    })
  }

render() {
    const { taskList } = this.state
    const cardItem = taskList.map((item, index) => <CardItem cardContext={item} key={index} />)
    return (
            <AtTabBar
                className="bottomBar"
                fixed
                fontSize="14"
                tabList={[
                  { title: '计划', iconType: 'bullet-list' },
                  { title: '拍照', iconType: 'camera' },
                  { title: '新建', iconType: 'folder' },
                ]}
                onClick={this.handleClick.bind(this)}
                current={this.state.current}
            />)
}