js get 方法拒绝访问

我有这样一段JS代码，在火狐下面运行正常没事，但是在IE下就报JS错误，说拒绝访问，也就是$get()方法过不去，请问这是什么原因，该如何解决？                 if (rlt == '1') {
                    var userName = document.getElementById("TB_Account").value;
                    
                    if (userName == "" || userName == null) {
                        return;
                    } else {
                           $.get("http://192.168.0.188:120/shortcut/reg.aspx?par=" + userName + "&ab=" + Math.random(), function (result) {
                            alert("返回值：" + result);
                            //如果已注册
                            if (result == 1) {
                                notice.className = "log_fx";
                                // aWritenResult = "0";
                                return false;
                            }
                            //如果未注册
                            else if (result == 0) {
                                notice.className = "log_fh";
                                // aWritenResult = "1";
                                return true;
                            }
                            else {                                notice.className = "log_fx";
                                //   aWritenResult = "0";
                                return false;
                            }
                        });
                    }
                }