小程序给循环的列表点击添加样式

 <!-- 标签列表 -->
    <view class='list'>
      <block wx:for='{{biaoqian}}'>
        <view data-id='{{item.id}}' data-key='{{index}}' wx:for-index="index"  class="{{item.status==0?'chan':''}}" bindtap='change'>
          {{item.name}}           
        </view>
      </block>
    </view>

js
  //选择标签
  change: function(e) {
    var that = this;
    var id = e.currentTarget.dataset.id //当前点击的id 
    that.data.tags_id.push(id)
    var index = e.currentTarget.dataset.key;
    if (that.data.biaoqian[index].status == 1) {
      that.data.biaoqian[index].status = 0;
    } 
    // else if (that.data.biaoqian[index].status == 0) {
    //   that.data.biaoqian[index].status = 1;
    // }
    that.setData({
      biaoqian: that.uniq(that.data.biaoqian)
    });
    console.log(that.data.biaoqian)
    that.setData({
      tags_id: that.uniq(that.data.tags_id),
      // key: e.target.dataset.index
    });
    console.log(that.data.tags_id)

  },