class Category extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
      currentIndex: 0
    }
    this.setCurrentIndex = this.setCurrentIndex.bind(this)
  }
  setCurrentIndex(event) {
    this.setState({
      currentIndex: parseInt(event.currentTarget.getAttribute('index'), 10)
    })
  }
  render() {
    let categoryArr = ['產(chǎn)品調(diào)整', '接口流量', '負載均衡', '第三方軟件調(diào)整',
              '安全加固', '性能控制', '日志查詢', '業(yè)務分析'];
    let itemList = [];
    for(let i = 0; i < categoryArr.length; i++) {
      itemList.push(<li key={i}
               className={this.state.currentIndex === i ? 'active' : ''}
               index={i} onClick={this.setCurrentIndex}
             >{categoryArr[i]}</li>);
    }
    return <ul className="category">{itemList}</ul>
  }
}

   .category {
      padding-left: 0;
      &:after {
        content: '';
        display: block;
        clear: both;
      }
      li {
        float: left;
        width: 23%;
        height: 40px;
        margin-right: 10px;
        margin-bottom: 10px;
        border: 1px solid $border-color;
        list-style: none;
        color: $font-color;
        line-height: 40px;
        text-align: center;
        font-size: 14px;
        cursor: pointer;
        &.active {
          border-color: #079ACD;
        }
     }