使用append往slice中添加一个值的时候，slice中的所有值均被修改

var data = make([]map[string]interface{}, 0)

var area = make(map[string]interface{})

maps_temp := []map[string]interface{}{{"id":1, "value":"a"},{"id":2, "value":"b"},{"id":3, "value":"c"}}    

for _, value := range maps_temp {
    area["id"] = value["id"]
    area["value"] = value["value"]

    data = append(data, area)
}
fmt.Println("data:",data)

The result is

data: [map[id:3 value:c] map[id:3 value:c] map[id:3 value:c]]

expected result is :

data: [map[id:1 value:a] map[id:2 value:b] map[id:3 value:c]]