去：不能解组吗？

package main

import "fmt"
import "encoding/json"

func main() {
    m := make(map[string]string)
    m["name"] = "Test"

    j, _ := json.Marshal(m)

    fmt.Println(string(j))

    var unmarshalled map[string]string
    _ = json.Unmarshal(j, unmarshalled)
    fmt.Println(unmarshalled)
}

Shouldn't unmarshalled be filled with the json data j

Don't ignore your errors

json: Unmarshal(non-pointer map[string]string)

unmarshaled needs to be a pointer:

err := json.Unmarshal(j, &unmarshalled)