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golang map 赋值 修改 陷阱
source link: https://studygolang.com/articles/32282
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golang map 赋值 修改 陷阱
jojo1313 · 大约6小时之前 · 19 次点击 · 预计阅读时间 1 分钟 · 不到1分钟之前 开始浏览无法修改同一个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]]
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