refactor(js): correct initialization of Config in GetConfig method

- Removed redundant initialization of the Config variable and ensured it is instantiated correctly before use.
- This change improves code clarity and maintains the intended functionality of the GetConfig method.

Author: mahongran

officialaccount/js/js.go

@@ -39,7 +39,6 @@ func (js *Js) SetJsTicketHandle(ticketHandle credential.JsTicketHandle) {
 // GetConfig 获取jssdk需要的配置参数
 // uri 为当前网页地址
 func (js *Js) GetConfig(uri string) (config *Config, err error) {
-	config = new(Config)
 	var accessToken string
 	accessToken, err = js.GetAccessToken()
 	if err != nil {
@@ -54,6 +53,7 @@ func (js *Js) GetConfig(uri string) (config *Config, err error) {
 	timestamp := util.GetCurrTS()
 	str := fmt.Sprintf("jsapi_ticket=%s&noncestr=%s&timestamp=%d&url=%s", ticketStr, nonceStr, timestamp, uri)
 	sigStr := util.Signature(str)
+	config = new(Config)
 	config.AppID = js.AppID
 	config.NonceStr = nonceStr
 	config.Timestamp = timestamp