例子1
package main
import (
"fmt"
)
func main() {
f := closer(10)
//fmt.Println(f(1))
//fmt.Println(f(2))
f(1)
f(2)
}
func closer(x int) func(int) int {
fmt.Printf("%p\n", &x)
return func(y int) int {
fmt.Printf("%p\n", &x)
return x + y
}
} 打印结果是：
0x118400e8 0x118400e8 0x118400e8
例子2
package main
import (
"fmt"
)
func main() {
for i := 0; i < 3; i++ {
defer func() {
fmt.Println(i)
}()
}
} 打印结果是：
3 3 3
例子3
package main
import (
"fmt"
)
func main() {
var fs = [4]func(){}
for i := 0; i < 4; i++ {
defer fmt.Println("defer i =", i)
defer func() {
fmt.Println("defer closure i=", i)
}()
fs[i] = func() {
fmt.Println("close i = ", i)
}
}
for _, f := range fs {
f()
}
} 打印结果：
close i = 4 close i = 4 close i = 4 close i = 4 defer closure i= 4 defer i = 3 defer closure i= 4 defer i = 2 defer closure i= 4 defer i = 1 defer closure i= 4 defer i = 0
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