javascript - split problem in js

Question

I originally wanted to write something to calculate working hours. Suddenly an error occurred here. I really can't see why. . . Doubt life. .
The gostr after console.log is of type string

Answer 1

Spelling split

Answer 2

I agree with the answer above, the questioner

Answer 3

What programmers are most afraid of is spelling mistakes. If they can’t find the error, they will start to doubt the public knowledge