在访问 https://appleid.apple.com/account?&localang=CN-ZH 这个页面的时候，页面会ajax一个特殊的header请求，其中的X-Apple-I-FD-Client-Info信息是一个json对象，本gist是整理后的F值获取方式源码。

X-Apple-I-FD-Client-Info.js

(function(m) {
  function g(e) {
    try {
      if (navigator.plugins && navigator.plugins.length)
        for (var t = 0; t < navigator.plugins.length; t++) {
          var n = navigator.plugins[t];
          if (n.name.indexOf(e) >= 0)
            return n.name + (n.description ? "|" + n.description : "")
        }
    } catch (r) {}
    return ""
  }
  function z(e) {
    try {
      if (!e)
        return A();
      var t;
      e: {
        var n;
        try {
          n = document.getElementById(e)
        } catch (r) {}
        if (null  === n || "undefined" == typeof n)
          try {
            n = document.getElementsByName(e)[0]
          } catch (a) {}
        if (null  === n || "undefined" == typeof n)
          for (var i = 0; i < document.forms.length; i++)
            for (var o = document.forms[i], s = 0; s < o.elements.length; s++) {
              var u = o[s];
              if (u.name === e || u.id === e) {
                t = u;
                break e
              }
            }
        t = n
      }
      if (null  !== t)
        try {
          t.value = A()
        } catch (l) {
          t.value = escape(l.message)
        }
    } catch (c) {}
  }
  function A(a) {
    var c = new Date
      , b = new Date
      , e = [t("TF1"), t("020"), function() {
      return ScriptEngineMajorVersion()
    }
    , function() {
      return ScriptEngineMinorVersion()
    }
    , function() {
      return ScriptEngineBuildVersion()
    }
    , function() {
      return i("{7790769C-0471-11D2-AF11-00C04FA35D02}")
    }
    , function() {
      return i("{89820200-ECBD-11CF-8B85-00AA005B4340}")
    }
    , function() {
      return i("{283807B5-2C60-11D0-A31D-00AA00B92C03}")
    }
    , function() {
      return i("{4F216970-C90C-11D1-B5C7-0000F8051515}")
    }
    , function() {
      return i("{44BBA848-CC51-11CF-AAFA-00AA00B6015C}")
    }
    , function() {
      return i("{9381D8F2-0288-11D0-9501-00AA00B911A5}")
    }
    , function() {
      return i("{4F216970-C90C-11D1-B5C7-0000F8051515}")
    }
    , function() {
      return i("{5A8D6EE0-3E18-11D0-821E-444553540000}")
    }
    , function() {
      return i("{89820200-ECBD-11CF-8B85-00AA005B4383}")
    }
    , function() {
      return i("{08B0E5C0-4FCB-11CF-AAA5-00401C608555}")
    }
    , function() {
      return i("{45EA75A0-A269-11D1-B5BF-0000F8051515}")
    }
    , function() {
      return i("{DE5AED00-A4BF-11D1-9948-00C04F98BBC9}")
    }
    , function() {
      return i("{22D6F312-B0F6-11D0-94AB-0080C74C7E95}")
    }
    , function() {
      return i("{44BBA842-CC51-11CF-AAFA-00AA00B6015B}")
    }
    , function() {
      return i("{3AF36230-A269-11D1-B5BF-0000F8051515}")
    }
    , function() {
      return i("{44BBA840-CC51-11CF-AAFA-00AA00B6015C}")
    }
    , function() {
      return i("{CC2A9BA0-3BDD-11D0-821E-444553540000}")
    }
    , function() {
      return i("{08B0E5C0-4FCB-11CF-AAA5-00401C608500}")
    }
    , function() {
      return eval("navigator.appCodeName")
    }
    , function() {
      return eval("navigator.appName")
    }
    , function() {
      return eval("navigator.appVersion")
    }
    , function() {
      return u(["navigator.productSub", "navigator.appMinorVersion"])
    }
    , function() {
      return eval("navigator.browserLanguage")
    }
    , function() {
      return eval("navigator.cookieEnabled")
    }
    , function() {
      return u(["navigator.oscpu", "navigator.cpuClass"])
    }
    , function() {
      return eval("navigator.onLine")
    }
    , function() {
      return eval("navigator.platform")
    }
    , function() {
      return eval("navigator.systemLanguage")
    }
    , function() {
      return eval("navigator.userAgent")
    }
    , function() {
      return u(["navigator.language", "navigator.userLanguage"])
    }
    , function() {
      return eval("document.defaultCharset")
    }
    , function() {
      return eval("document.domain")
    }
    , function() {
      return eval("screen.deviceXDPI")
    }
    , function() {
      return eval("screen.deviceYDPI")
    }
    , function() {
      return eval("screen.fontSmoothingEnabled")
    }
    , function() {
      return eval("screen.updateInterval")
    }
    , function() {
      return 0 !== Math.abs(p - q)
    }
    , function() {
      return C(c)
    }
    , function() {
      return "@UTC@"
    }
    , function() {
      var e = 0;
      return e = 0,
      C(c) && (e = Math.abs(p - q)),
      e = -(c.getTimezoneOffset() + e) / 60;
    }
    , function() {
      return new Date(2005,5,7,21,33,44,888).toLocaleString()
    }
    , function() {
      return eval("screen.width")
    }
    , function() {
      return eval("screen.height")
    }
    , function() {
      return n.Acrobat
    }
    , function() {
      return n.Flash
    }
    , function() {
      return n.QuickTime
    }
    , function() {
      return n["Java Plug-in"]
    }
    , function() {
      return n.Director
    }
    , function() {
      return n.Office
    }
    , function() {
      return "@CT@"
    }
    , function() {
      return p
    }
    , function() {
      return q
    }
    , function() {
      return c.toLocaleString()
    }
    , function() {
      return eval("screen.colorDepth")
    }
    , function() {
      return eval("window.screen.availWidth")
    }
    , function() {
      return eval("window.screen.availHeight")
    }
    , function() {
      return eval("window.screen.availLeft")
    }
    , function() {
      return eval("window.screen.availTop")
    }
    , function() {
      return g("Acrobat")
    }
    , function() {
      return g("Adobe SVG")
    }
    , function() {
      return g("Authorware")
    }
    , function() {
      return g("Citrix ICA")
    }
    , function() {
      return g("Director")
    }
    , function() {
      return g("Flash")
    }
    , function() {
      return g("MapGuide")
    }
    , function() {
      return g("MetaStream")
    }
    , function() {
      return g("PDFViewer")
    }
    , function() {
      return g("QuickTime")
    }
    , function() {
      return g("RealOne")
    }
    , function() {
      return g("RealPlayer Enterprise")
    }
    , function() {
      return g("RealPlayer Plugin")
    }
    , function() {
      return g("Seagate Software Report")
    }
    , function() {
      return g("Silverlight")
    }
    , function() {
      return g("Windows Media")
    }
    , function() {
      return g("iPIX")
    }
    , function() {
      return g("nppdf.so")
    }
    , function() {
      var e = document.createElement("span");
      e.innerHTML = "&nbsp;",
      e.style.position = "absolute",
      e.style.left = "-9999px",
      document.body.appendChild(e);
      var t = e.offsetHeight;
      return document.body.removeChild(e),
      t
    }
    , k(), k(), k(), k(), k(), k(), k(), k(), k(), k(), k(), k(), k(), k(), function() {
      return "5.6.1-0"
    }
    , k()];
    F();
    for (var f = "", d = 0; d < e.length; d++) {
      a && (f += v(e[d].toString(), '"', "'", !0),
      f += "=");
      var h;
      try {
        h = e[d](this)
      } catch (l) {
        h = ""
      }
      f += a ? h : escape(h),
      f += ";",
      a && (f += "\\n")
    }
    return f = v(f, escape("@UTC@"), (new Date).getTime()),
    f = v(f, escape("@CT@"), (new Date).getTime() - b.getTime()),
    D && w ? w(f) : f
  }
  function v(e, t, n, r) {
    "boolean" != typeof r && (r = !1);
    for (var a, i = !0; (a = e.indexOf(t)) >= 0 && (r || i); )
      e = e.substr(0, a) + n + e.substr(a + t.length),
      i = !1;
    return e
  }
  function C(e) {
    var t = Math.min(p, q);
    return 0 !== Math.abs(p - q) && e.getTimezoneOffset() === t
  }
  function F() {
    for (var e = ["Acrobat", "Flash", "QuickTime", "Java Plug-in", "Director", "Office"], t = 0; t < e.length; t++) {
      var r = e[t]
        , a = n
        , i = r
        , o = r;
      r = "";
      try {
        if (navigator.plugins && navigator.plugins.length) {
          var s = RegExp(o + ".* ([0-9._]+)");
          for (o = 0; o < navigator.plugins.length; o++) {
            var u = s.exec(navigator.plugins[o].name);
            null  === u && (u = s.exec(navigator.plugins[o].description)),
            u && (r = u[1])
          }
        } else if (window.ActiveXObject && x[o])
          try {
            var l = new ActiveXObject(x[o][0]);
            r = x[o][1](l)
          } catch (c) {
            r = ""
          }
      } catch (d) {
        r = d.message
      }
      a[i] = r
    }
  }
  function u(a) {
    for (var c = 0; c < a.length; c++)
      try {
        var b = eval(a[c]);
        if (b)
          return b
      } catch (e) {}
    return ""
  }
  function i(e) {
    var t = "";
    try {
      "undefined" != typeof o.a.getComponentVersion && (t = o.a.getComponentVersion(e, "ComponentID"))
    } catch (n) {
      e = n.message.length,
      e = e > 40 ? 40 : e,
      t = escape(n.message.substr(0, e))
    }
    return t
  }
  function t(e) {
    return function() {
      return e
    }
  }
  function G(e) {
    function t(e) {
      for (r = r << e[0] | e[1],
      a += e[0]; a >= 6; )
        e = r >> a - 6 & 63,
        n += s.substring(e, e + 1),
        a -= 6,
        r ^= e << a
    }
    var n = ""
      , r = 0
      , a = 0;
    t([6, (7 & e.length) << 3 | 0]),
    t([6, 56 & e.length | 1]);
    for (var i = 0; i < e.length; i++) {
      if (void 0 == y[e.charCodeAt(i)])
        return;
      t(y[e.charCodeAt(i)])
    }
    return t(y[0]),
    a > 0 && t([6 - a, 0]),
    n
  }
  function w(e) {
    for (var t = G, n = e, r = 0; E[r]; r++)
      n = n.split(E[r]).join(String.fromCharCode(r + 1));
    if (t = t(n),
    void 0 == t)
      return e;
    for (n = 65535,
    r = 0; r < e.length; r++)
      n = 65535 & (n >>> 8 | n << 8),
      n ^= 255 & e.charCodeAt(r),
      n ^= (255 & n) >> 4,
      n ^= n << 12 & 65535,
      n ^= (255 & n) << 5 & 65535;
    return n &= 65535,
    e = "",
    e += s.charAt(n >>> 12),
    e += s.charAt(n >>> 6 & 63),
    e += s.charAt(63 & n),
    t += e
  }
  options = m || {};
  m = options.ctx || window;
  var D = options.hasOwnProperty("compress") ? options.compress : !0
    , o = {}
    , p = new Date(2005,0,15).getTimezoneOffset()
    , q = new Date(2005,6,15).getTimezoneOffset()
    , n = []
    , k = t("")
    , x = {
    Flash: ["ShockwaveFlash.ShockwaveFlash", function(e) {
      return e.getVariable("$version")
    }
    ],
    Director: ["SWCtl.SWCtl", function(e) {
      return e.ShockwaveVersion("")
    }
    ]
  };
  try {
    o.a = document.createElement("span"),
    "undefined" != typeof o.a.addBehavior && o.a.addBehavior("#default#clientCaps")
  } catch (H) {}
  n = {};
  var y = {
    1: [4, 15],
    110: [8, 239],
    74: [8, 238],
    57: [7, 118],
    56: [7, 117],
    71: [8, 233],
    25: [8, 232],
    101: [5, 28],
    104: [7, 111],
    4: [7, 110],
    105: [6, 54],
    5: [7, 107],
    109: [7, 106],
    103: [9, 423],
    82: [9, 422],
    26: [8, 210],
    6: [7, 104],
    46: [6, 51],
    97: [6, 50],
    111: [6, 49],
    7: [7, 97],
    45: [7, 96],
    59: [5, 23],
    15: [7, 91],
    11: [8, 181],
    72: [8, 180],
    27: [8, 179],
    28: [8, 178],
    16: [7, 88],
    88: [10, 703],
    113: [11, 1405],
    89: [12, 2809],
    107: [13, 5617],
    90: [14, 11233],
    42: [15, 22465],
    64: [16, 44929],
    0: [16, 44928],
    81: [9, 350],
    29: [8, 174],
    118: [8, 173],
    30: [8, 172],
    98: [8, 171],
    12: [8, 170],
    99: [7, 84],
    117: [6, 41],
    112: [6, 40],
    102: [9, 319],
    68: [9, 318],
    31: [8, 158],
    100: [7, 78],
    84: [6, 38],
    55: [6, 37],
    17: [7, 73],
    8: [7, 72],
    9: [7, 71],
    77: [7, 70],
    18: [7, 69],
    65: [7, 68],
    48: [6, 33],
    116: [6, 32],
    10: [7, 63],
    121: [8, 125],
    78: [8, 124],
    80: [7, 61],
    69: [7, 60],
    119: [7, 59],
    13: [8, 117],
    79: [8, 116],
    19: [7, 57],
    67: [7, 56],
    114: [6, 27],
    83: [6, 26],
    115: [6, 25],
    14: [6, 24],
    122: [8, 95],
    95: [8, 94],
    76: [7, 46],
    24: [7, 45],
    37: [7, 44],
    50: [5, 10],
    51: [5, 9],
    108: [6, 17],
    22: [7, 33],
    120: [8, 65],
    66: [8, 64],
    21: [7, 31],
    106: [7, 30],
    47: [6, 14],
    53: [5, 6],
    49: [5, 5],
    86: [8, 39],
    85: [8, 38],
    23: [7, 18],
    75: [7, 17],
    20: [7, 16],
    2: [5, 3],
    73: [8, 23],
    43: [9, 45],
    87: [9, 44],
    70: [7, 10],
    3: [6, 4],
    52: [5, 1],
    54: [5, 0]
  }
    , E = ["%20", ";;;", "%3B", "%2C", "und", "fin", "ed;", "%28", "%29", "%3A", "/53", "ike", "Web", "0;", ".0", "e;", "on", "il", "ck", "01", "in", "Mo", "fa", "00", "32", "la", ".1", "ri", "it", "%u", "le"]
    , s = ".0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz";
  o.appidmsform = z,
  o.f1b5 = w,
  m.appidmsparm = o,
  D && (m = navigator.userAgent.toLowerCase(),
  "Gecko" === navigator.product && parseInt(m.substring(m.indexOf("rv:") + 3, m.indexOf(")", m.indexOf("rv:") + 3)).split(".")[0]) <= 2 && z())
})();

var F = window.appidmsparm.appidmsform();

请问window和navigator怎么定义呢，我使用python调用

import execjs
with open('dev.js', 'r') as f:
    code = f.read()
code = 'var window = {};var navigator = {userAgent: "' + user_agent + '", language:"' + language + '"};' + code
ctx = execjs.compile(code)
client_id = ctx.call('r', False)