这里是想实现聊天功能，所以有一个ChatOnline集合来保存用户是否在线 ChatOnline集合里只有一条数据，user1是1813100并且user2是18121300的数据 [图片] 当我用开发工具登录18131000的账号，用多账号测试或者真机登录18121300账号的时候，18131000退出时返回正常，但18121300用户退出时数据库查询函数查出的数据如图，和实际数据库的内容不符 [图片] onUnload: function () {         var that = this         const uid = wx.getStorageSync('uid')         const info = wx.getStorageSync('info')         db.collection('ChatOnline') //更新自己的在线状态         .where(db.command.or([             {                 user1:info.id,                 user2:uid,             },             {                 user1:uid,                 user2:info.id             },           ]))         .get()         .then(res=>{             console.log(res.data) //这里返回的数据错误             if(res.data[0].user1=info.id)             {                 console.log("use1")                 db.collection('ChatOnline') //更新自己的状态                 .where({                     user1:info.id,                     user2:uid                 }).update({                     data:{                         user1online:false                       }                 }).then(res=>{                     console.log('退出')                 })             }             else{                 console.log("use2")                 db.collection('ChatOnline') //更新自己的状态                 .where({                     user2:info.id,                     user1:uid                 }).update({                     data:{                         user2online:false                       }                 }).then(res=>{                     console.log('退出')                 })             }         }) } [图片]

尝试了用promise，但输出编号发现还是异步执行     for(let i =0;i<res.data.length;i++)    {     var id = res.data[i].uid;     new Promise((resolve, reject) => {         console.log(id)         db.collection('Student')         .where({             _id:id         }).get()         .then(res=>{             if(res.data.length==0)             {                 db.collection('Teacher')                 .where({                     _id:id                 }).get()                 .then(res=>{                     that.data.headlist.push(res.data[0].pic)                     that.setData({                         headlist:that.data.headlist,                     })                     setTimeout(function () {                         console.log(i)                         resolve()                     }, 500)                                      }).catch(res=>{                     console.log(res)                 })             }             else             {                 that.data.headlist.push(res.data[0].pic)                 that.setData({                     headlist:that.data.headlist,                 })                 setTimeout(function () {                     console.log(i)                     resolve()                 }, 500)             }         })     })   } [图片]

我想实现封禁到时间自动解除的功能，day是封禁天数，time是封禁时的时间戳 我在云函数里写了触发器并上传了，但没有起作用，日志里没看到调用记录 记录判断条件的正确写法该怎么写？ const cloud = require('wx-server-sdk') cloud.init() const db = cloud.database(); // 云函数入口函数 exports.main = async (event, context) => {     const wxContext = cloud.getWXContext()     var nowtime = Date.parse(new Date())/1000; //当前时间     const $ = db.command.aggregate;     return await db.collection('Blocked')     .aggregate()     .project({         matched:$.gt([nowtime,'$time'+'$day'*24*3600]),         time:1,         day:1,     })     .match({         matched:true     })     .end()     .remove()      } [图片]

wx.openDocument不支持视频后缀的样子，该用什么保存？

如题

<view wx:for="{{chatlist}}" wx:for-item="item" >         <view wx:if="{{item.type=='text'}}" style="display: flex;position: relative;">             <view class="self">                 <text>{{item.content}}</text>             </view>             <image src="../../image/righttr.png" style="width: 40rpx;" mode="widthFix"></image>         </view> </view>     .self{         background-color:rgb(36,80,134);         color: white;         border-radius: 7%;         width: auto;         right: 20rpx;         min-height: 50rpx;         margin-bottom: 20rpx;         padding-left: 20rpx;         padding-right: 30rpx;         padding-top: 10rpx;         padding-bottom: 10rpx;         word-break: break-all;     } [图片]

如题，想实现聊天功能，但该如何有新数据时实时刷新页面呢？

比如说我要查询集合col里，要想筛选出a、b字段符合(a=1&&b=2) ||(a=2&&b=1)的记录该怎么查?

想实现同步，getData调用getathead，getathead又调用gethead，但出现promise未定义的报错，请问正确该怎么写 onLoad: function (options) {         this.getData();     }, async getData(){         var that= this         var id = wx.getStorageSync('info').id         db.collection('Notice')         .where({             message:"@",             noticed:id         }).get()         .then(res=>{             that.setData({                 atlist:res.data             })             that.getathead();         })     }, async getathead(){         var p = this.data.atlist;         return new promise((reslove,reject)=>{             for(let i =0;i<p.length;i++)             {                 this.gethead(p.uid);             }             reslove()         })     }, gethead(id){         var list=this.data.headlist;         return new promise((reslove,reject)=>{             db.collection('Student')             .where({                 _id:id             }).get()             .then(res=>{                 if(res.data.length==0)                 {                     db.collection('Teacher')                     .where({                         _id:id                     }).get()                     .then(res=>{                         list.push(res.data[0].pic)                         this.setData({                             headlist:list,                         })                         reslove()                     })                 }                 else                 {                     list.push(res.data[0].pic)                     this.setData({                         headlist:list,                     })                     reslove()                 }             })                      })     }, [图片]

这里我想调用getgood函数将数据保存到goodlist中，再显示到页面中，但在加载完毕前已经渲染完了，不显示已经加载的数据，如何解决？ onLoad: function (options) {         this.getData();         this.getpos();     }, getpos(){         var  c= wx.getStorageSync('com');         var that = this;             db.collection('Post').where({  //获取全部贴文                 major:c,             }).orderBy('time','desc').get()             .then(res=>{                 that.setData({                     postlist:res.data                 })                 that.getgood().then(res=>{                     console.log(res)                 })             })             .catch(err=>{                 console.log("无法获取",err)             })     },   getgood(){         var poslist = this.data.postlist;         var list = [];         var id = wx.getStorageSync('info').id         var that = this;         return new Promise((resolve, reject) => {             for(let i =0;i<poslist.length;i++)             {                 db.collection('Good')                 .where({                     pid:poslist[i]._id,                     uid:id,                 })                 .get()                 .then(res=>{                     if(res.data.length==0)                     {                         list.push(false)                     }                     else                         list.push(true)                 })                 if(i+1==poslist.length)                 {                     that.setData({                         goodlist:list                     })                     resolve(list);                 }             }         })     }, [图片]