success (res) {
  for (let i = 0; i < res.data.uesrs.length; i++) {
    let obj_json = res.data.uesrs[i].hashtag;
    let obj_jsons = JSON.parse(obj_json).imageList;
    that.setData({
      obj_json: obj_jsons
    })
  }
  that.setData({
    dataList: res.data.uesrs
  })
}

<view class="card" wx:for="{{dataList}}" wx:key="id">
  <view class="title">{{item.content}}</view>
  <view class="title" id="{{item.id}}" bindtap="dailyDetail">{{common.getGap(item.last)}}</view>
  <view wx:for="{{obj_json}}" wx:for-item="obj" wx:key="key">
    <view>{{obj.fileUrl}}</view>
  </view>
</view>

只循环了最后一条，而不是对应显示，麻烦大家帮忙看看，谢谢了。