```go package main import ( "log" "time" ) var myMap = make(map[int64]int64) // 计算阶乘 func factorial(n int64) int64 { if n == 0 { return 1 } var i int64 = 1 var res int64 = 1 for ; i <= n; i++ { res *= i } return res } func putMap(n int64) { myMap[n] = factorial(n) } func main() { for i := 1; i <= 20; i++ { go putMap(int64(i)) } time.Sleep(3 * time.Second) // 遍历map for i, v := range myMap { log.Println(i, v) } } ```
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