精确统计网站访问量的程序中，主函数（最后调用的那个函数）怎么传参或者运行。

Question

代码是这样的

/**

 * vlstat 浏览器统计脚本

 */

var statIdName = "vlstatId";

var xmlHttp;

/**

 * 设置cookieId

 */

function setCookie(c_name, value, expiredays) {

    var exdate = new Date();

    exdate.setDate(exdate.getDate() + expiredays);

    document.cookie = c_name + "=" + escape(value) + ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString()) + ";path=/;domain=cecb2b.com";

}

/**

 * 获取cookieId

 */

function getCookie(c_name) {

    if (document.cookie.length > 0) {

        c_start = document.cookie.indexOf(c_name + "=");

        if (c_start != -1) {

            c_start = c_start + c_name.length + 1;

            c_end = document.cookie.indexOf(";", c_start);

            if (c_end == -1) {

                c_end = document.cookie.length;

            }

            return unescape(document.cookie.substring(c_start, c_end));

        }

    }

    return "";

}

/**

 * 获取当前时间戳

 */

function getTimestamp() {

    var timestamp = Date.parse(new Date());

    return timestamp;

}

/**

 * 生成statId

 */

function genStatId() {

    var cookieId = getTimestamp();

    cookieId = "vlstat" + "-" + cookieId + "-" + Math.round(Math.random() * 3000000000);

    return cookieId;

}

/**

 * 设置StatId

 */

function setStatId() {

    var cookieId = genStatId();

    setCookie(statIdName, cookieId, 365);

}

/**

 * 获取StatId

 */

function getStatId() {

    var statId = getCookie(statIdName);

    if (statId != null && statId.length > 0) {

        return statId;

    } else {

        setStatId();

        return getStatId();

    }

}

/**

 * 获取UA

 */

function getUA() {

    var ua = navigator.userAgent;

    if (ua.length > 250) {

        ua = ua.substring(0, 250);

    }

    return ua;

}

/**

 * 获取浏览器类型

 */

function getBrower() {

    var ua = getUA();

    if (ua.indexOf("Maxthon") != -1) {

        return "Maxthon";

    } else if (ua.indexOf("MSIE") != -1) {

        return "MSIE";

    } else if (ua.indexOf("Firefox") != -1) {

        return "Firefox";

    } else if (ua.indexOf("Chrome") != -1) {

        return "Chrome";

    } else if (ua.indexOf("Opera") != -1) {

        return "Opera";

    } else if (ua.indexOf("Safari") != -1) {

        return "Safari";

    } else {

        return "ot";

    }

}

/**

 * 获取浏览器语言

 */

function getBrowerLanguage() {

    var.browserLanguage;

    return lang != null && lang.length > 0 ? lang : "";

}

/**

 * 获取操作系统

 */

function getPlatform() {

    return navigator.platform;

}

/**

 * 获取页面title

 */

function getPageTitle() {

    return document.title;

}

/**

 * 创建一个form

 * 

 * @return

 */

function createSubmitForm() {

    var frm = document.createElement("form");

    document.body.appendChild(frm);

    frm.method = "POST";

    return frm;

}

/**

 * 为form创建一个元素

 * 

 * @param inputForm

 * @param elementName

 * @param elementValue

 * @return

 */

function createFormElement(frmInput, elementName, elementValue) {

    var element = document.createElement("input");

    element.setAttribute("id", elementName);

    element.setAttribute("name", elementName);

    element.setAttribute("type", "hidden");

    element.setAttribute("value", elementValue);

    frmInput.appendChild(element);

    return element;

}

/**

 * 构造XMLHttpRequest对象

 * 

 * @return

 */

function createXMLHttpRequest() {  

 if (window.ActiveXObject) {  

  xmlHttp = new ActiveXObject('Microsoft.XMLHTTP');  

 } else if (window.XMLHttpRequest) {  

  xmlHttp = new XMLHttpRequest();  

 }  

}

/**

 * url指定跳转页,data是要post的数据。func类似于函数指针

 * 

 * @param url

 * @param data

 * @param func

 * @return

 */

function AjaxPost(url, data, func) {

    var httpRequest = createHttpRequest();

    if (httpRequest) {

        httpRequest.open("POST", url, true);

        httpRequest.setRequestHeader("content-length", data.length);

        httpRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

        httpRequest.send(data);

        httpRequest.onreadystatechange = function() {

            if (httpRequest.readyState == 4) {

                try {

                    if (httpRequest.status == 200) {

                        if (func) {

                            // 这里可以调用想要的函数

                            func(httpRequest.responseText);

                        }

                    }

                } catch (e) {

                    alert("Error XMLHttpRequest!");

                }

            }

        }

    } else {

        alert("Error initializing XMLHttpRequest!");

    }

}

function vlstatInitLE(vlch, vlch1, vlch2, vlch3) {

    var p;

    var vlstatCH = vlch != null && vlch.length > 0 ? vlch : "";

    var vlstatCH1 = vlch1 != null && vlch1.length > 0 ? vlch1 : "";

    var vlstatCH2 = vlch2 != null && vlch2.length > 0 ? vlch2 : "";

    var vlstatCH3 = vlch3 != null && vlch3.length > 0 ? vlch3 : "";

    var vlstatCookieId = getStatId();

    var vlstatUA = encodeURIComponent(getUA());

    var vlstatIPAddress = document.localName;

    var vlstatREFURL = encodeURIComponent(document.referrer);

    var vlstatURL = encodeURIComponent(document.URL);

    var vlstatScreenX = screen.width;

    var vlstatScreenY = screen.height;

    var vlstatOS = getPlatform();

    var vlstatBrower = getBrower();

    var vlstatBrowerLanguage = getBrowerLanguage();

    var vlstatPageTitle = encodeURIComponent(getPageTitle());

    var vlstatAction = "index.php";

    p = "cookieId=" + vlstatCookieId + "&ua=" + vlstatUA + "&ip=" + vlstatIPAddress + "&refurl="

            + vlstatREFURL + "&url=" + vlstatURL + "&screenX=" + vlstatScreenX + "&screenY=" + vlstatScreenY

            + "&os=" + vlstatOS + "&brower=" + vlstatBrower + "&browerLang=" + vlstatBrowerLanguage

            + "&title=" + vlstatPageTitle + "&ch=" + vlstatCH + "&ch1=" + vlstatCH1 + "&ch2=" + vlstatCH2

            + "&ch3=" + vlstatCH3;

    var urlGo = vlstatAction + "?" + p;

    createXMLHttpRequest();

 xmlHttp.open('GET', urlGo);

 xmlHttp.send(null);

}