```go
package main
import (
"encoding/json"
"fmt"
)
var h map[string]string
func init() {
h = map[string]string{
"a": "aa",
"b": "bb",
}
}
func main() {
// 复制map不影响原map
bs, _ := json.Marshal(h)
var h2 map[string]string
err := json.Unmarshal(bs, &h2)
if err != nil {
fmt.Println("error: ", err.Error())
}
h2["c"] = "cc"
if _, ok := h["c"]; !ok {
fmt.Println("key is not exist!")
}
if _, ok := h2["c"]; ok {
fmt.Println("key is exist!")
}
}
```
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