'init'

main.go

@@ -0,0 +1,26 @@
+package main
+
+import "fmt"
+
+func GetSum() func(int) int {
+	var sum int = 0
+	return func(x int) int {
+		sum = sum + x
+		return sum
+	}
+}
+func add(num1 int, num2 int) int {
+	defer fmt.Println(num1) //3
+	defer fmt.Println(num2) //进入栈中  栈的特点是 先进后出2
+	var sum int = num1 + num2
+	fmt.Println(sum) //先执行1
+	return sum       //4
+}
+
+func main() {
+	f := GetSum()
+	fmt.Println(f(1))
+	fmt.Println(f(2))
+	fmt.Println(f(3))
+	fmt.Println(add(30, 60))
+}