gsp中js为

 $.post("modifyRight",//用../..路径不正确
{"repoName":repoName},function(data,state){
         alert("state="+state)
      alert(data.result.repoRight);
},"json");

或者

$.ajax({
  url: 'modifyRight',data: { repoName: repoName },success: function(data,status,xhr) {
      var responseJson = data;
      typeAheadSource = responseJson.result.repositories;
     
  },error: function(xhr,error) {
     
  }
});

后台为：

def modifyRight(){
    String repoName = params['repoName']
    render(contentType: "text/json") {
        result(repoRight:"后台测试")
    }