go 遍歷修改切片數據

package main

import "fmt"

type good struct {
	id  int64
	sum int64
}

func main() {
	good1 := good{1, 3}
	good2 := good{1, 3}

	good := []good{}
	good = append(good, good1, good2)

	for _, v := range good {
		//修改值(無效)
		v.sum = 7
	}
	fmt.Println(good)

	for i, v := range good {
		fmt.Println(v)
		//修改值成功
		good[i].sum = 7
	}
	fmt.Println(good)

}