小程序云函数中用group分组查询，只能查询20条，怎么解决？
用滚动条每次加10加载，希望对您有帮助。
fetchNickYMCount: function() {
db.collection('findingList').aggregate()
.group({
_id: {
userName: '$userName',
writeYM: '$writeYM',
},
t: $.sum(1)
})
.sort({
_id:-1
})
.skip(this.data.s)
.limit(this.data.l)
.end()
.then(res => {
this.setData({
result: this.data.result.concat(res.list)
})
// console.log(this.data.result)
})
},
lower:function(){
this.setData({
s:this.data.s+10,
l:this.data.l+10
})
this.fetchNickYMCount()
},
WXML:
<scroll-view scroll-y="true" class="scoll-h" lower-threshold="100" bindscrolltolower="lower" style='height:878rpx;overflow-y: scroll;padding-top:1rpx;' >
<view class='history-table-wrap'>
<view class="table">
<view class="tr">
<view class="th th1">填写人</view>
<view class="th th2">填写年月</view>
<view class="th th3">共计</view>
</view>
<view class="tr" wx:for="{{result}}" wx:key="{{index}}">
<view class="td td1">{{item._id.userName}}</view>
<view class="td td2">{{item._id.writeYM}}</view>
<view class="td td3">{{item.t}}</view>
</view>
</view>
</view>
</scroll-view>