更新 NetworkErr 判断逻辑

client.go

@@ -88,7 +88,7 @@ func (c *Client) do(req *http.Request) (*http.Response, error) {
 		}
 	}
 	if err != nil {
-		err = ErrorWrapper(NetworkErr, err.Error())
+		err = fmt.Errorf("%w: %s", NetworkErr, err.Error())
 	}
 	for _, hook := range c.HttpHooks {
 		hook.AfterRequest(resp, err)

errors.go

@@ -4,19 +4,6 @@ import (
 	"errors"
 )
 
-type errorWrapper struct {
-	err error
-	msg string
-}
-
-func (e errorWrapper) Unwrap() error { return e.err }
-
-func (e errorWrapper) Error() string { return e.msg }
-
-func ErrorWrapper(err error, msg string) error {
-	return &errorWrapper{msg: msg, err: err}
-}
-
 var NetworkErr = errors.New("wechat network error")
 
 func IsNetworkError(err error) bool {

errors_test.go

@@ -2,12 +2,13 @@ package openwechat
 
 import (
 	"errors"
+	"fmt"
 	"testing"
 )
 
 func TestIsNetworkError(t *testing.T) {
 	var err = errors.New("test error")
-	err = ErrorWrapper(NetworkErr, err.Error())
+	err = fmt.Errorf("%w: %s", NetworkErr, err.Error())
 	if !IsNetworkError(err) {
 		t.Error("err is not network error")
 	}