<movable-area class="area" >

        <movable-view direction="horizontal"  class="view" >{{userMessage.nickName}}</movable-view>

        <navigator url="{{'/pages/detail/detail? userId=' + userMessage._id}}" open-type="navigate">

          <image src="{{userMessage.userPhoto}}" />

        </navigator>

        <view class="delete" >删除</view>

</movable-area>

为什么这样获取不到id呢？

 lifetimes: {

    attached: function() {

        db.collection('users').doc(this.data.messageId).field({

 userPhoto:true,

          nickName:true

        }).get().then((res)=>{

          this.setData({

            userMessage: res.data

          })

        })

    }

  }

这是报错

VM2036 WAService.js:2 Error: errCode: -1  | errMsg: collection.doc:fail docId must not be empty; at collection.doc api;