Novice old question: variable scope. OK in development tools, the real machine debugging is various-CodePudding

This program in development tools directly the console. The log shows calls, traverse the works, in the end with real machine debugging error, length undefine,

 

OnLoad: function () {

Var that=this; 
Const eventChannel=this. GetOpenerEventChannel () 
EventChannel. On (' acceptDataFromOpenerPage ', function (data) {
That the setData ({
Result: the data [0], 
UserAnswer: data [1], 
}) 
}) 

Var userAnswer=this. Data. UserAnswer; 
Var result=this. Data. The result; 

Var maxCount=0; 
Var unitCount=[]; 

The console. The log (result) 
for (let i=0; i Var letnum=result [I] num 
Var yourCount=0 

for (let i=0; i YourCount=yourCount + parseInt (userAnswer [letnum [I]]). 
} 
UnitCount=unitCount. Concat (yourCount) 



}