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package main import ( "fmt" ) func main() { fmt.Println(doubleScore(0)) //0 fmt.Println(doubleScore(20.0)) //40 fmt.Println(doubleScore(50.0)) //50 } func doubleScore(source float32) (score float32) { defer func() { if score < 1 || score >= 100 { //将影响返回值 score = source } }() score = source * 2 return //或者 //return source * 2 }
