let a="abc" let b="bcd" 如何让c="abc-bcd"????试验这样不行： let c=a+"-"+b 不行

[图片] 我想更新endtime,  //res已经获取到     var index=res.data[0].ringtime.length-1                      console.log('index',index)                      db.collection("usersRing").doc(res.data[0]._id).update({                       data: {                         'ringtime'.+[index].endtime:new Date(),                       },                       success: resk =>{                        wx.showToast({                          title: '打卡成功',                          icon: 'success',                        })                      console.log("创建数据成功", resk)                       },                       fail: err => {                         wx.showToast({                           title: '程序出错',                           icon: '',                         })                       }                     })  打印程序出错

const cloud = require('wx-server-sdk') cloud.init({   // API 调用都保持和云函数当前所在环境一致   env: cloud.DYNAMIC_CURRENT_ENV,   traceUser: true }) const db = cloud.database() // 云函数入口函数 exports.main = async (event, context) => {   var docid = event.id   var group = event.group   var salaryperhour = event.salaryperhour   if(group=="users"){          return  await db.collection(group).doc(docid).update({         data: {           salaryperhour:salaryperhour,         }       })   }} js：        wx.cloud.callFunction({             name:"dataset",             data:{               group:"users",               id:that.data.id,               salaryperhour:that.data.salaryperhour             },success:function(){               wx.showToast({                 title: '成功',                 icon: "none",                                })             }           }) 日志： {"errorCode":1,"errorMessage":"user code exception caught","stackTrace":"Error: errCode: -502005 database collection not exists | errMsg: [ResourceNotFound] Db or Table not exist. Please check your request, but if the problem cannot be solved, contact us.; \n at Object.returnAsCloudSDKError (/var/user/node_modules/wx-server-sdk/index.js:6121:16)\n at Object.checkError (/var/user/node_modules/wx-server-sdk/index.js:1418:23)\n at Promise (/var/user/node_modules/wx-server-sdk/index.js:1335:33)\n at process._tickCallback (internal/process/next_tick.js:68:7)"}

[图片]getscancode:function(){   var that=this db.collection("Ringscancode").where({admincompany:that.data.usercompany}).get({   success:function(res){     if(res.data.length>0){       console.log("Ringscancodedata",res.data)       var code=res.data[0].code       wx.scanCode({         onlyFromCamera: true,         success (re) {           let getcode=re.result           console.log('getcode',re.result)           console.log("code",code )           if( getcode==code ){             db.collection("usersRing").where({ today: util.formatDate(new Date()), _openid: that.data.openid  }).get({               success: function (res) {                 console.log("查询有无打卡数据", res)                  if(res.data.length==0){                    db.collection("usersRing").add({                      data: {                        usernickName: that.data.usernickName,                        usercompany: that.data.usercompany,                        username: that.data.username,                        today: util.formatDate(new Date()),                        MRinguptime: new Date(0),                        MRingdowntime: new Date(0),                        ARinguptime: new Date(0),                        ARingdowntime: new Date(0),                        ERinguptime: new Date(0),                        ERingdowntime: new Date(0),                        URinguptime: new Date(0),                        URingdowntime: new Date(0)                      },                      success: res =>{                        wx.navigateTo({                          url: '../userpage1-1/userpage1-1',                        }) ,console.log("创建数据成功", res)                      },                      fail: err => {                        wx.showToast({                          title: '程序出错',                          icon: '',                        })                      }                    })                  }                  else {                    console.log("直接跳转")                    wx.navigateTo({                      url: '../userpage1-1/userpage1-1',                             })                    }                           }             })           }else{             wx.showToast({               title: '无效二维码',               icon:"none"             })           }            }       })     }else{       console.log("Ringscancodedata",res.data)    wx.showToast({      title: '管理员未开启此功能',      icon:"none",    })     }   }, }) }, code 和 getcode打印出来的是一样的，就是执行函数后不执行if（code==getcode）后的语句 打印code==getcode是false

getscancode:function(){   var that=this db.collection("Ringscancode").where({admincompany:that.data.usercompany}).get({   success:function(res){     if(res.data.length>0){       console.log("Ringscancodedata",res.data)       var code=res.data[0].code       wx.scanCode({         onlyFromCamera: true,         success (re) {           let getcode=re.result           console.log('getcode',re.result)           console.log("code",code )           if( getcode==code ){             db.collection("usersRing").where({ today: util.formatDate(new Date()), _openid: that.data.openid  }).get({               success: function (res) {                 console.log("查询有无打卡数据", res)                  if(res.data.length==0){                    db.collection("usersRing").add({                      data: {                        usernickName: that.data.usernickName,                        usercompany: that.data.usercompany,                        username: that.data.username,                        today: util.formatDate(new Date()),                        MRinguptime: new Date(0),                        MRingdowntime: new Date(0),                        ARinguptime: new Date(0),                        ARingdowntime: new Date(0),                        ERinguptime: new Date(0),                        ERingdowntime: new Date(0),                        URinguptime: new Date(0),                        URingdowntime: new Date(0)                      },                      success: res =>{                        wx.navigateTo({                          url: '../userpage1-1/userpage1-1',                        }) ,console.log("创建数据成功", res)                      },                      fail: err => {                        wx.showToast({                          title: '程序出错',                          icon: '',                        })                      }                    })                  }                  else {                    console.log("直接跳转")                    wx.navigateTo({                      url: '../userpage1-1/userpage1-1',                             })                    }                           }             })           }else{             wx.showToast({               title: '无效二维码',               icon:"none"             })           }            }       })     }else{       console.log("Ringscancodedata",res.data)    wx.showToast({      title: '管理员未开启此功能',      icon:"none",    })     }   }, }) }, code 和 getcode打印出来的是一样的，就是执行函数后不执行if（code==getcode）后的语句

我的小程序发布好几天了，不知道为啥搜索栏里搜索不到，请教大神。。

有时间帮忙看看，谢谢！