在golang中筛选出bson.M中的值

package main

import (
    "fmt"
    "gopkg.in/mgo.v2/bson"
)

func main() {
    data := bson.M{
        "name":   "John",
        "age":    30,
        "gender": "male",
    }

    // 筛选出bson.M中的值
    for key, value := range data {
        switch v := value.(type) {
        case string:
            fmt.Printf("%s: %s\n", key, v)
        case int:
            fmt.Printf("%s: %d\n", key, v)
        // 其他类型的处理
        default:
            fmt.Printf("%s: %v\n", key, v)
        }
    }
}