微信小程序的点击添加样式，多个选择

  view  class="flex-wrap" wx:for="{{comments}}" wx:key="{{comments}}">
    <image mode='widthFix' src="{{item.url}}"></image>
    <view class="left">
      <view class="top">
        <view>{{item.name}}</view>
        <view>{{item.number}} <text wx:for-index="index" data-index="{{index}}" bindtap='dianji' class="iconfont icon-zan" style="{{item.checked?'color:red;':'color:#bfbfbf;'}}"></text></view>
      </view>
      <view class="bottom">
        {{item.contents}}
      </view>

  //js
   dianji:function(e){
      console.log(e.currentTarget.dataset.index)
      var index = e.currentTarget.dataset.index
      var comments = this.data.comments
      var that = this
      comments[index].checked = !comments[index].checked
      that.setData({
            comments: comments
       })
      console.log(comments[index].checked)
}, //音乐