微信小程序，云开发，表单提交文本和图片，

//表单提交至数据库

//参考文章https://www.jianshu.com/p/1365c4556c32?utm_campaign=maleskine&utm_content=note&utm_medium=seo_notes&utm_source=recommendation

btnSub(res){

  var that = this;

  var filelist = that.data.fileList;//fileList储存临时地址

  let timestamp = (new Date()).valueOf();//用于命名cloudpath

  var date=new Date();//用于获取时间

  var now=date.getFullYear()+"/"+date.getMonth()+"/"+date.getDate()+" "+date.getHours()+":"+date.getMinutes();    //得到此时的时间

  var content=res.detail.value.content;//将编辑框的内容存在content中

  var i=0//用于for循环

  for(;i

    var image_fileID=that.data.image_fileID//定义局部image_fileID接收数据

    var filePath=filelist[i].url//filePath为缓存图片存在的地址

    var cloudPath=timestamp + '.png'//cloudPath为图片在数据库的名字或地址，以时间戳为地址

    console.log(filePath)

    console.log(cloudPath)

    wx.cloud.uploadFile({

      cloudPath,//上传至云端的路径

      filePath,//小程序临时文件地址

      success: res => {//返回文件ID res.fileID

        console.log('[上传文件] 成功：', res)

        console.log(res.fileID)

        image_fileID.push(res.fileID)//这是局部image_fileID用push添加数据

        that.setData({

          image_fileID:image_fileID,//j局部image_fileID传值给全局image_fileID 

        })

        console.log('image_fileID: '+image_fileID)

        console.log('image_fileID.length: '+image_fileID.length)

        console.log('i='+i)

        console.log('filelist.length:'+filelist.length)

        if(filelist.length===image_fileID.length)//当所有图片的fileID都记录下来时执行数据库上传

        { //在里面如果定义数据会出问题，具体原因不清楚

          console.log('filelist.length:'+filelist.length)

          db.collection("speak").add({//speak为数据库集合名称

            data:{       

              time:now,                           //提交数据

              content:content,

              image_fileID:that.data.image_fileID,

           }

         }).then(res=>{

           console.log("---res")

           console.log(res)

         })

       }

       else{

         console.log("meijinqu")

        }

       },fail: e => {

         console.error('[上传文件] 失败：', e)

       }

     })  

  }

},