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Use Wx The showactionsheet selection box modifies the information in the database. Why does it report an error that data is not defined

2022-04-22 02:05:00 【CSDN Q & A】

The phenomenon and background of the problem
Problem related code , Do not paste screenshots 
 wx.showActionSheet({                  itemList: this.data.gly,                  success (res) {                    console.log(res.tapIndex)                    if(res.tapIndex===0){                        db.collection("lyj").doc(e.currentTarget.id).update({                              data:{                                    ['sj.'+this.data.sjxxindex+'.0']:0                              },                              success:res=>{                                    console.log("cheng success ")                                    },                        })                    }else if(res.tapIndex===1){                        db.collection("lyj").doc(e.currentTarget.id).update({                              data:{                                    ['sj.'+this.data.sjxxindex+'.0']:2                              },                        })                    }else if(res.tapIndex==2){                        db.collection("lyj").doc(e.currentTarget.id).update({                              data:{                                    ['sj.'+this.data.sjxxindex+'.0']:1                              },                                    success:res=>{                                          wx.showToast({                                            title:' Modification successful ',                                            icon:'success',                                            duration:2000,})                                          }                        })                    }                  },                  fail (res) {                    console.log(res.errMsg,' Modification failed ')                  }                })
Operation results and error reporting contents

VM758 WAService.js:2 TypeError: Cannot read property 'data' of undefined
at success (reserve.js:276)
at Object.s. (VM758 WAService.js:2)
at VM758 WAService.js:2
at Module.Sr (VM758 WAService.js:2)
at VM758 WAService.js:2
at qJ (VM758 WAService.js:2)
at r.success (VM758 WAService.js:2)
at :65031/appservice/
at Object.success (VM758 WAService.js:2)
at a (VM758 WAService.js:2)(env: macOS,mp,1.05.2203030; lib: 2.23.4)

My solution ideas and tried methods
What I want to achieve


Take the answer ：

Maybe the third line doesn't use the arrow function , Lead to this Caused by different references .

//  The third line success:(res)=>{

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