go 语言 for循环的一个坑

1、案例1

package main

import "fmt"

type Card struct {
	id int
}

func main() {
	list := make([]*Card, 0)
	card := &Card{}
	for index := 1; index < 10; index++ {
		card.id = index
		list = append(list, card)
	}
	//fmt.Println(list)
	for _, c := range list {
		fmt.Println(*c)
	}
}

输出结果：

2、案例2

package main

import "fmt"

type Card struct {
	id int
}

func main() {
	list := make([]*Card, 0)
	card := &Card{}
	for index := 1; index < 10; index++ {
		card = &Card{
			id: index,
		}
		list = append(list, card)
	}
	for _, c := range list {
		fmt.Println("Card", c)
	}
}

输出结果：

3、案例3

package main

import "fmt"

type Card struct {
	id int
}

func main() {
	list := make([]*Card, 0)

	for index := 1; index < 10; index++ {
		card := &Card{}
		card.id = index
		list = append(list, card)
	}
	for _, c := range list {
		fmt.Println("Card", c)
	}
}

输出结果：