JS读取服务器返回的XMl格式字符串

function PostSMS(phoneNumber, sessionID, requestUrl, successAction) {
    $.ajax(
                {
                    type: 'POST',
                    url: requestUrl,
                    data: {
                        mobile: phoneNumber,
                        sessionId: sessionID
                    },

                    success: function (response, stutas, xhr) {
                        var result = response.documentElement.textContent || response.text;
                        if (result.toLowerCase() == "true") {
                            successAction();
                        } else {
                            MobileBusiness.ShowTip("验证码发送失败,请稍候再试");
                        }
                    },
                    error: function (err) {
                        MobileBusiness.ShowTip(err.responseText);
                    }
                }
            );
}