这段代码是来自sf的百度统计，图片来自百度统计的后台。
从图片所知，百度可以获取到基本的设备信息、访客类型、访问频次、访问来源、上次访问时间、入口页面、最后停留页面、每次打开页面的时间、停留时长、页面地址。
从代码得知，记录了设备信息、设置了访客标识码的cookies，读取了浏览器标识等。运用了localStorage、sessionStorage。
猜测的原理：通过cookies设置的访客标识码判断访客类型（新老访客），访问频次也好理解（通过多条记录读取某时间段有多少条记录），访问来源（从搜索引擎跳转过来的还是直接输入网址），上次访问时间（读取最近的一条记录的时间），入口页面（第一条记录的url），最后停留页面（最后一条记录的url），每次页面停留时长（不会是两条记录的时间差吧），
那么问题来了：
大家回答的能具体点就具体点吧，谢谢各位了。
http://hm.baidu.com/hm.gif?cc=1&ck=1&cl=24-bit&ds=1280x800&ep=6648%2C3211&et=3&fl=17.0&ja=1&ln=zh-CN&lo=0<=1426499689&nv=0&rnd=798622641&si=e23800c454aa573c0ccb16b52665ac26&st=4&su=http%3A%2F%2Fsegmentfault.com%2Fask&v=1.0.75&lv=3&u=http%3A%2F%2Fsegmentfault.com%2F
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}, ma: function () {
if ("undefined" === typeof window._bdhm_account || window._bdhm_account === c.id) {
window._bdhm_account = c.id;
var a = window._hmt;
if (a && a.length)for (var b = 0, e = a.length; b < e; b++)d.e(a[b],
"Array") && "_trackEvent" !== a[b][0] && "_trackRTEvent" !== a[b][0] ? f.J(a[b]) : f.r.push(a[b]);
window._hmt = f.S
}
}, na: function () {
if (0 < f.r.length)for (var a = 0, b = f.r.length; a < b; a++)f.J(f.r[a]);
f.r = q
}, J: function (a) {
if (d.e(a, "Array")) {
var b = a[0];
if (f.hasOwnProperty(b) && d.e(f[b], "Function"))f[b](a)
}
}, _trackPageview: function (a) {
if (1 < a.length && a[1].charAt && "/" == a[1].charAt(0)) {
f.d |= 4;
h.b.a.et = 0;
h.b.a.ep = "";
h.b.H ? (h.b.a.nv = 0, h.b.a.st = 4) : h.b.H = p;
var b = h.b.a.u, d = h.b.a.su;
h.b.a.u = n.protocol + "//" + document.location.host +
a[1];
f.T || (h.b.a.su = document.location.href);
h.b.h();
h.b.a.u = b;
h.b.a.su = d
}
}, _trackEvent: function (a) {
2 < a.length && (f.d |= 8, h.b.a.nv = 0, h.b.a.st = 4, h.b.a.et = 4, h.b.a.ep = b(a[1]) + "*" + b(a[2]) + (a[3] ? "*" + b(a[3]) : "") + (a[4] ? "*" + b(a[4]) : ""), h.b.h())
}, _setCustomVar: function (a) {
if (!(4 > a.length)) {
var d = a[1], e = a[4] || 3;
if (0 < d && 6 > d && 0 < e && 4 > e) {
f.A++;
for (var s = (h.b.a.cv || "*").split("!"), t = s.length; t < d - 1; t++)s.push("*");
s[d - 1] = e + "*" + b(a[2]) + "*" + b(a[3]);
h.b.a.cv = s.join("!");
a = h.b.a.cv.replace(/[^1](\*[^!]*){2}/g, "*").replace(/((^|!)\*)+$/g,
"");
"" !== a ? h.b.setData("Hm_cv_" + c.id, encodeURIComponent(a), c.age) : h.b.Da("Hm_cv_" + c.id)
}
}
}, _setReferrerOverride: function (a) {
1 < a.length && (h.b.a.su = a[1].charAt && "/" == a[1].charAt(0) ? n.protocol + "//" + window.location.host + a[1] : a[1], f.T = p)
}, _trackOrder: function (b) {
b = b[1];
d.e(b, "Object") && (a(b), f.d |= 16, h.b.a.nv = 0, h.b.a.st = 4, h.b.a.et = 94, h.b.a.ep = g.stringify(b), h.b.h())
}, _trackMobConv: function (a) {
if (a = {
webim: 1,
tel: 2,
map: 3,
sms: 4,
callback: 5,
share: 6
}[a[1]])f.d |= 32, h.b.a.et = 93, h.b.a.ep = a, h.b.h()
}, _trackRTPageview: function (b) {
b =
b[1];
d.e(b, "Object") && (a(b), b = g.stringify(b), 512 >= encodeURIComponent(b).length && (f.d |= 64, h.b.a.rt = b))
}, _trackRTEvent: function (b) {
b = b[1];
if (d.e(b, "Object")) {
a(b);
b = encodeURIComponent(g.stringify(b));
var e = function (a) {
var b = h.b.a.rt;
f.d |= 128;
h.b.a.et = 90;
h.b.a.rt = a;
h.b.h();
h.b.a.rt = b
}, l = b.length;
if (900 >= l)e.call(this, b); else for (var l = Math.ceil(l / 900), s = "block|" + Math.round(Math.random() * n.l).toString(16) + "|" + l + "|", t = [], u = 0; u < l; u++)t.push(u), t.push(b.substring(900 * u, 900 * u + 900)), e.call(this, s + t.join("|")),
t = []
}
}, _setUserId: function (a) {
a = a[1];
if (d.e(a, "String") || d.e(a, "Number")) {
var b = h.b.G(), g = "hm-" + h.b.a.v;
f.V = f.V || Math.round(Math.random() * n.l);
e.log("//datax.baidu.com/x.gif?si=" + c.id + "&dm=" + encodeURIComponent(b) + "&ac=" + encodeURIComponent(a) + "&v=" + g + "&li=" + f.V + "&rnd=" + Math.round(Math.random() * n.l))
}
}
};
f.init();
h.ba = f;
return h.ba
})();
(function () {
function a() {
"undefined" == typeof window["_bdhm_loaded_" + c.id] && (window["_bdhm_loaded_" + c.id] = p, this.a = {}, this.H = r, this.init())
}
var b = mt.url, e = mt.M, d = mt.B, g = mt.lang, n = mt.cookie, l = mt.i, f = mt.localStorage, k = mt.sessionStorage, m = h.g, v = h.k;
a.prototype = {
I: function (a, b) {
a = "." + a.replace(/:\d+/, "");
b = "." + b.replace(/:\d+/, "");
var d = a.indexOf(b);
return -1 < d && d + b.length == a.length
}, U: function (a, b) {
a = a.replace(/^https?:\/\//, "");
return 0 === a.indexOf(b)
}, t: function (a) {
for (var d = 0; d < c.dm.length; d++)if (-1 <
c.dm[d].indexOf("/")) {
if (this.U(a, c.dm[d]))return p
} else {
var e = b.R(a);
if (e && this.I(e, c.dm[d]))return p
}
return r
}, G: function () {
for (var a = document.location.hostname, b = 0, d = c.dm.length; b < d; b++)if (this.I(a, c.dm[b]))return c.dm[b].replace(/(:\d+)?[\/\?#].*/, "");
return a
}, Q: function () {
for (var a = 0, b = c.dm.length; a < b; a++) {
var d = c.dm[a];
if (-1 < d.indexOf("/") && this.U(document.location.href, d))return d.replace(/^[^\/]+(\/.*)/, "$1") + "/"
}
return "/"
}, ta: function () {
if (!document.referrer)return m.j - m.p > c.vdur ? 1 : 4;
var a =
r;
this.t(document.referrer) && this.t(document.location.href) ? a = p : (a = b.R(document.referrer), a = this.I(a || "", document.location.hostname));
return a ? m.j - m.p > c.vdur ? 1 : 4 : 3
}, getData: function (a) {
try {
return n.get(a) || k.get(a) || f.get(a)
} catch (b) {
}
}, setData: function (a, b, d) {
try {
n.set(a, b, {domain: this.G(), path: this.Q(), F: d}), d ? f.set(a, b, d) : k.set(a, b)
} catch (e) {
}
}, Da: function (a) {
try {
n.set(a, "", {domain: this.G(), path: this.Q(), F: -1}), k.remove(a), f.remove(a)
} catch (b) {
}
}, Ha: function () {
var a, b, d, e, f;
m.p = this.getData("Hm_lpvt_" +
c.id) || 0;
13 == m.p.length && (m.p = Math.round(m.p / 1E3));
b = this.ta();
a = 4 != b ? 1 : 0;
if (d = this.getData("Hm_lvt_" + c.id)) {
e = d.split(",");
for (f = e.length - 1; 0 <= f; f--)13 == e[f].length && (e[f] = "" + Math.round(e[f] / 1E3));
for (; 2592E3 < m.j - e[0];)e.shift();
f = 4 > e.length ? 2 : 3;
for (1 === a && e.push(m.j); 4 < e.length;)e.shift();
d = e.join(",");
e = e[e.length - 1]
} else d = m.j, e = "", f = 1;
this.setData("Hm_lvt_" + c.id, d, c.age);
this.setData("Hm_lpvt_" + c.id, m.j);
d = m.j == this.getData("Hm_lpvt_" + c.id) ? "1" : "0";
if (0 === c.nv && this.t(document.location.href) &&
("" === document.referrer || this.t(document.referrer)))a = 0, b = 4;
this.a.nv = a;
this.a.st = b;
this.a.cc = d;
this.a.lt = e;
this.a.lv = f
}, W: function () {
for (var a = [], b = 0, d = m.X.length; b < d; b++) {
var e = m.X[b], f = this.a[e];
"undefined" != typeof f && "" !== f && a.push(e + "=" + encodeURIComponent(f))
}
b = this.a.et;
this.a.rt && (0 === b ? a.push("rt=" + encodeURIComponent(this.a.rt)) : 90 === b && a.push("rt=" + this.a.rt));
return a.join("&")
}, Ia: function () {
this.Ha();
this.a.si = c.id;
this.a.su = document.referrer;
this.a.ds = l.Ea;
this.a.cl = l.colorDepth + "-bit";
this.a.ln = l.language;
this.a.ja = l.javaEnabled ? 1 : 0;
this.a.ck = l.cookieEnabled ? 1 : 0;
this.a.lo = "number" == typeof _bdhm_top ? 1 : 0;
this.a.fl = d.ua();
this.a.v = "1.0.75";
this.a.cv = decodeURIComponent(this.getData("Hm_cv_" + c.id) || "");
1 == this.a.nv && (this.a.tt = document.title || "");
var a = document.location.href;
this.a.cm = b.o(a, m.xa) || "";
this.a.cp = b.o(a, m.ya) || "";
this.a.cw = b.o(a, m.wa) || "";
this.a.ci = b.o(a, m.va) || "";
this.a.cf = b.o(a, m.za) || ""
}, init: function () {
try {
this.Ia(), 0 === this.a.nv ? this.Ga() : this.L(".*"), h.b = this, this.ca(),
v.s("pv-b"), this.Fa()
} catch (a) {
var b = [];
b.push("si=" + c.id);
b.push("n=" + encodeURIComponent(a.name));
b.push("m=" + encodeURIComponent(a.message));
b.push("r=" + encodeURIComponent(document.referrer));
e.log(m.protocol + "//" + m.K + "?" + b.join("&"))
}
}, Fa: function () {
function a() {
v.s("pv-d")
}
"undefined" === typeof window._bdhm_autoPageview || window._bdhm_autoPageview === p ? (this.H = p, this.a.et = 0, this.a.ep = "", this.h(a)) : a()
}, h: function (a) {
var b = this;
b.a.rnd = Math.round(Math.random() * m.l);
v.s("stag-b");
var d = m.protocol + "//" +
m.K + "?" + b.W();
v.s("stag-d");
b.$(d);
e.log(d, function (d) {
b.L(d);
g.e(a, "Function") && a.call(b)
})
}, ca: function () {
var a = document.location.hash.substring(1), d = RegExp(c.id), e = -1 < document.referrer.indexOf(m.aa) ? p : r, f = b.o(a, "jn"), g = /^heatlink$|^select$/.test(f);
a && (d.test(a) && e && g) && (a = document.createElement("script"), a.setAttribute("type", "text/javascript"), a.setAttribute("charset", "utf-8"), a.setAttribute("src", m.protocol + "//" + c.js + f + ".js?" + this.a.rnd), f = document.getElementsByTagName("script")[0], f.parentNode.insertBefore(a,
f))
}, $: function (a) {
var b = k.get("Hm_unsent_" + c.id) || "", d = this.a.u ? "" : "&u=" + encodeURIComponent(document.location.href), b = encodeURIComponent(a.replace(/^https?:\/\//, "") + d) + (b ? "," + b : "");
k.set("Hm_unsent_" + c.id, b)
}, L: function (a) {
var b = k.get("Hm_unsent_" + c.id) || "";
b && ((b = b.replace(RegExp(encodeURIComponent(a.replace(/^https?:\/\//, "")).replace(/([\*\(\)])/g, "\\$1") + "(%26u%3D[^,]*)?,?", "g"), "").replace(/,$/, "")) ? k.set("Hm_unsent_" + c.id, b) : k.remove("Hm_unsent_" + c.id))
}, Ga: function () {
var a = this, b = k.get("Hm_unsent_" +
c.id);
if (b)for (var b = b.split(","), d = function (b) {
e.log(m.protocol + "//" + decodeURIComponent(b).replace(/^https?:\/\//, ""), function (b) {
a.L(b)
})
}, f = 0, g = b.length; f < g; f++)d(b[f])
}
};
return new a
})();
var w = h.g, x = h.load;
if (c.apps) {
var z = [w.protocol, "//ers.baidu.com/app/s.js?"];
z.push(c.apps);
x(z.join(""))
}
var C = h.g, D = h.load;
if (c.conv && "http:" === C.protocol) {
var E = ["http://page.baidu.com/conversion_js.php?sid="];
E.push(c.conv);
D(E.join(""))
}
var F = h.g, G = h.load;
c.lxb && G([F.protocol, "//lxbjs.baidu.com/lxb.js?sid=", c.lxb].join(""));
var H = h.load, I = h.g.protocol;
if (c.qiao) {
for (var J = [I + "//goutong.baidu.com/site/"], K = c.id, L = 5381, M = K.length, N = 0; N < M; N++)L = (33 * L + Number(K.charCodeAt(N))) % 4294967296;
2147483648 < L && (L -= 2147483648);
J.push(L % 1E3 + "/");
J.push(c.id + "/b.js");
J.push("?siteId=" + c.qiao);
H(J.join(""))
}
;
console.log(H);
})();
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
正好之前也做过一点类似的东西，因为好久没关注，所以可能也会有问题大家一起讨论:
- 百度的js可以为你的网站生成一个唯一的uuid保存在cookie里所以如果cookie清了的话单凭这个uuid是会被认为是新用户的，当然也可是使用用户id之类的唯一标识
- 记录页面使用时长的其实还是比较麻烦的，之前考虑过使用
onbeforeunload，但是因为部分浏览器不支持，所以不具有普遍性，第二种方法是在第二次发送数据的时候发送refer的使用时长。- 百度不收地域信息，因为后台程序可以根据请求头来获得ip还有浏览器信息等，至于地域信息，有个叫ip库的东西。
- 3,5是同一个问题，就是通过请求这张小图片来提交数据的，楼上已经说了:))
- 至于安全，可能后台接收数据会有一个规则，不符合这个规则的就不会入库。
1，基本对了
2，IP是在你请求百度服务器的时候，后台来获取的，根据IP可以得到地域信息
3，new Image().src,请求是通过GET模式发送的，通过请求1x1的图片，在querystring中带参数（搜“new Image”）
4,不懂，应该没做频率限制，只是在最后日志入库之前做了数据清洗
5，看第3点
这几天一直在研究这个，也找到了相关链接，记录下来方便大家查看。
http://www.chinaz.com/web/2012/1012/278119.shtml
http://blog.csdn.net/fudesign2008/article/details/6772108
http://blog.csdn.net/iqzq123/article/details/8877645?
谷歌分析：http://www.biaodianfu.com/google-analytics-architecture.html
http://oldj.net/article/one-thing-to-notice-about-new-image/
我的网站
为什么数据相差那么大！！
我的个人网站 http://www.zhoulujun.cn/