云函数的表达式count问题？

kkkk 2020-11-10 4465 浏览问题模块： API和组件

请问一下知道的大神，我要用语句count算出userGroup数组中有多少项，数据库语句要如何修改？

麻烦知道的大神告知一下，麻烦直接复制以下代码修改，谢谢

var count = await db.collection("xxx").where({
        _id: dataArr[i]._id,
      }).count();

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dialog_with_head" style=";"><div class="dialog_wrp_new dialog_component" style="width:600px;"><div class="dialog"><a href="javascript:;" class="icon16_opr closed pop_closed">关闭</a><div class="dialog_hd"><h3>新增或编辑超链接</h3></div><div class="dialog_bd"><div class="frm_control_group"><label for="" class="frm_label">链接地址</label><div class="frm_controls"><span class="frm_input_box"><input type="text" value="https://" class="frm_input"/></span></div></div></div><div class="dialog_ft"><a href="javascript:;" class="btn btn_info">确认</a><a href="javascript:;" class="btn btn_default">取消</a></div></div></div></div><div class="dialog_wrapper dialog__insert-video dialog_with_head" style=";"><div class="dialog_wrp_new dialog_component" style="width:600px;"><div class="dialog"><a href="javascript:;" class="icon16_opr closed pop_closed">关闭</a><div class="dialog_hd"><h3>插入视频</h3></div><div class="dialog_bd"><div class="frm_control_group"><label for="" class="frm_label">视频链接</label><div class="frm_controls"><span class="frm_input_box"><input type="text" placeholder="仅支持插入腾讯视频" value="" class="frm_input"/></span></div></div></div><div class="dialog_ft"><a href="javascript:;" class="btn btn_info">确认</a><a href="javascript:;" class="btn btn_default">取消</a></div></div></div></div></div><div class="tool_bar tr"><a href="javascript:;" class="btn btn_primary edui-default">发表</a></div></div></div><div itemprop="text" class="post_comment_content" style="display:;"><pre class="ql-syntax" spellcheck="false"><span class="hljs-keyword">let</span> item = await db.collection(<span class="hljs-string">"xxx"</span>).doc(dataArr[i]._id).<span class="hljs-keyword">get</span>()

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