IP地址

if (!/^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])(\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])){3}$/.test($.trim($('#addIPAddress').val()))) {
                        alert('IP地址格式不正确，请重新输入！');
                        $('#addIPAddress').focus();
                    }