golang map 赋值 修改 陷阱
2020-12-22 本文已影响0人
jojo1313
无法修改同一个make创建的map，只能修改不同make创建的map
func Maptest() {
var data_list []map[string]interface{}
subdata := make(map[string]interface{}) //第一次make
subdata["synctag"] = ""
data_list=append(data_list,subdata)
subdata = make(map[string]interface{}) //第二次make
subdata["synctag"] = "1"
data_list=append(data_list,subdata)
fmt.Println("==========")
fmt.Println(data_list)
data_list[0]["synctag"]="10.21.11.13"
fmt.Println(data_list)
}
返回结果： 修改成功
==========
[map[synctag:] map[synctag:1]]
[map[synctag:10.21.11.13] map[synctag:1]]
func Maptest() {
var data_list []map[string]interface{}
subdata := make(map[string]interface{}) //make一次
subdata["synctag"] = ""
data_list=append(data_list,subdata)
//subdata = make(map[string]interface{})
subdata["synctag"] = "1"
data_list=append(data_list,subdata)
fmt.Println("==========")
fmt.Println(data_list)
data_list[0]["synctag"]="10.21.11.13"
fmt.Println(data_list)
}
返回结果：修改失败
==========
[map[synctag:1] map[synctag:1]]
[map[synctag:10.21.11.13] map[synctag:10.21.11.13]]
