Golang uses JSON unmarshal number to interface{} number to become float64 type (turn)

JSON unmarshal Number to interface{} The number becomes float64 type

Use Golang analysis JSON When formatting data , If the interface{} Receive digital members , Then it will be parsed according to the following rules , so

Use Golang Yes JSON Structure (unmarshal) when ,JSON The number in the structure will be parsed as float64 type ：

bool, for JSON booleans
 
    float64, for JSON numbers
 
    string, for JSON strings
 
    []interface{}, for JSON arrays
 
    map[string]interface{}, for JSON objects
 
    nil for JSON null

If you want to convert to integer , You can cast ：

int( a["id"].(float64) )  //  take  interface{}  Type of  “id”  The key is declared as  float64  type , Re convert to  int  type 

from ：Golang Use JSON unmarshal Number to interface{} The number becomes float64 type

interface{} convert to int A general function of

​
func GetInterfaceToInt(t1 interface{}) int {
	var t2 int
	switch t1.(type) {
	case uint:
		t2 = int(t1.(uint))
		break
	case int8:
		t2 = int(t1.(int8))
		break
	case uint8:
		t2 = int(t1.(uint8))
		break
	case int16:
		t2 = int(t1.(int16))
		break
	case uint16:
		t2 = int(t1.(uint16))
		break
	case int32:
		t2 = int(t1.(int32))
		break
	case uint32:
		t2 = int(t1.(uint32))
		break
	case int64:
		t2 = int(t1.(int64))
		break
	case uint64:
		t2 = int(t1.(uint64))
		break
	case float32:
		t2 = int(t1.(float32))
		break
	case float64:
		t2 = int(t1.(float64))
		break
	case string:
		t2, _ = strconv.Atoi(t1.(string))
		break
	default:
		t2 = t1.(int)
		break
	}
	return t2
}

from ：go in Interface{} turn int