a = append(a, 0) // 切片扩展1个空间
copy(a[i+1:], a[i:]) // a[i:]向后移动1个位置
a[i] = x // 设置新添加的元素
a = append(a, x...) // 为x切片扩展足够的空间
copy(a[i+len(x):], a[i:]) // a[i:]向后移动len(x)个位置
copy(a[i:], x) // 复制新添加的切片
// 以下是把medal的数组插在vups前列,同时删除vups中和medal重复的元素
type vup struct {
Mid int64 `gorm:"column:mid;primary_key"`
Uname string `gorm:"column:uname"`
Roomid int64 `gorm:"column:roomid"`
}
type medal struct {
Uname string `json:"target_name"`
medalInfo `json:"medal_info"`
}
type medalInfo struct {
Mid int64 `json:"target_id"`
MedalName string `json:"medal_name"`
Level int64 `json:"level"`
MedalColorStart int64 `json:"medal_color_start"`
MedalColorEnd int64 `json:"medal_color_end"`
MedalColorBorder int64 `json:"medal_color_border"`
}
func main(){
frontVups := make([]vup, 0)
medalMap := make(map[int64]medal)
for _, v := range medals {
up := vup{
Mid: v.Mid,
Uname: v.Uname,
}
frontVups = append(frontVups, up)
medalMap[v.Mid] = v
}
vups = append(vups, frontVups...)
copy(vups[len(frontVups):], vups)
copy(vups, frontVups)
for i := len(frontVups); i < len(vups); i++ {
if _, ok := medalMap[vups[i].Mid]; ok {
vups = append(vups[:i], vups[i+1:]...)
i--
}
}
}