今日头条web版的有评论，h5的没有，因此来抓web数据。
抓取数据url类似于：
https://www.toutiao.com/c/user/article/?page_type=1&user_id=3185984155&max_behot_time=1547470938&count=20&as=A1255CA416EB048&cp=5C463BA08468DE1&_signature=tkD47BAV6hThd7C3DbM4WbZA-P
其中max_behot_time是从上条数据中获取，类似于offset，as&cp比较好分析，用默认值也可以。
重点分析_signature，首先看_signature怎么来的？
chrome里进入开发者模式，然后ctrl+shift+f进入全局搜索，查找_signature出处：
image
image
首先AS & CP代码比较简单，还有默认值，试了下默认值也可以用，如果懒得话：
image
然后_signature的破解：
image
可以看出，里面有些莫名特殊字符，这些支付最后需要被置换成正常的function字符串，替换方法：
.replace(/[-]/g, function(i) { return e[15 & i.charCodeAt(0)] })
替换参数：
"v[x++]=v[--x]t.charCodeAt(b++)-32function return ))++.substrvar .length(),b+=;break;case ;break}".split("")
在js中把他们当做字符串运行一下就可知结果。
最后参数调用。
需要注意：global.navigator.userAgent 需要与请求的user-agent一致。**
详细代码：
function get_signature(behot) {
function e(e, a, r) {
return (b[e] || (b[e] = t("x,y", "return x " + e + " y")))(r, a)
}
function a(e, a, r) {
return (k[r] || (k[r] = t("x,y", "return new x[y](" + Array(r + 1).join(",x[++y]").substr(1) + ")")))(e, a)
}
function r(e, a, r) {
var n, t, s = {},
b = s.d = r ? r.d + 1 : 0;
for (s["$" + b] = s, t = 0; t < b; t++) s[n = "$" + t] = r[n];
for (t = 0, b = s.length = a.length; t < b; t++) s[t] = a[t];
return c(e, 0, s)
}
function c(t, b, k) {
function u(e) {
v[x++] = e
}
function f() {
return g = t.charCodeAt(b++) - 32,
t.substring(b, b += g)
}
function l() {
try {
y = c(t, b, k)
} catch(e) {
h = e,
y = l
}
}
for (var h, y, d, g, v = [], x = 0;;) switch (g = t.charCodeAt(b++) - 32) {
case 1:
u(!v[--x]);
break;
case 4:
v[x++] = f();
break;
case 5:
u(function(e) {
var a = 0,
r = e.length;
return function() {
var c = a < r;
return c && u(e[a++]),
c
}
} (v[--x]));
break;
case 6:
y = v[--x],
u(v[--x](y));
break;
case 8:
if (g = t.charCodeAt(b++) - 32, l(), b += g, g = t.charCodeAt(b++) - 32, y === c) b += g;
else if (y !== l) return y;
break;
case 9:
v[x++] = c;
break;
case 10:
u(s(v[--x]));
break;
case 11:
y = v[--x],
u(v[--x] + y);
break;
case 12:
for (y = f(), d = [], g = 0; g < y.length; g++) d[g] = y.charCodeAt(g) ^ g + y.length;
u(String.fromCharCode.apply(null, d));
break;
case 13:
y = v[--x],
h = delete v[--x][y];
break;
case 14:
v[x++] = t.charCodeAt(b++) - 32;
break;
case 59:
u((g = t.charCodeAt(b++) - 32) ? (y = x, v.slice(x -= g, y)) : []);
break;
case 61:
u(v[--x][t.charCodeAt(b++) - 32]);
break;
case 62:
g = v[--x],
k[0] = 65599 * k[0] + k[1].charCodeAt(g) >>> 0;
break;
case 65:
h = v[--x],
y = v[--x],
v[--x][y] = h;
break;
case 66:
u(e(t[b++], v[--x], v[--x]));
break;
case 67:
y = v[--x],
d = v[--x],
u((g = v[--x]).x === c ? r(g.y, y, k) : g.apply(d, y));
break;
case 68:
u(e((g = t[b++]) < "<" ? (b--, f()) : g + g, v[--x], v[--x]));
break;
case 70:
u(!1);
break;
case 71:
v[x++] = n;
break;
case 72:
v[x++] = +f();
break;
case 73:
u(parseInt(f(), 36));
break;
case 75:
if (v[--x]) {
b++;
break
}
case 74:
g = t.charCodeAt(b++) - 32 << 16 >> 16,
b += g;
break;
case 76:
u(k[t.charCodeAt(b++) - 32]);
break;
case 77:
y = v[--x],
u(v[--x][y]);
break;
case 78:
g = t.charCodeAt(b++) - 32,
u(a(v, x -= g + 1, g));
break;
case 79:
g = t.charCodeAt(b++) - 32,
u(k["$" + g]);
break;
case 81:
h = v[--x],
v[--x][f()] = h;
break;
case 82:
u(v[--x][f()]);
break;
case 83:
h = v[--x],
k[t.charCodeAt(b++) - 32] = h;
break;
case 84:
v[x++] = !0;
break;
case 85:
v[x++] = void 0;
break;
case 86:
u(v[x - 1]);
break;
case 88:
h = v[--x],
y = v[--x],
v[x++] = h,
v[x++] = y;
break;
case 89:
u(function() {
function e() {
return r(e.y, arguments, k)
}
return e.y = f(),
e.x = c,
e
} ());
break;
case 90:
v[x++] = null;
break;
case 91:
v[x++] = h;
break;
case 93:
h = v[--x];
break;
case 0:
return v[--x];
default:
u((g << 16 >> 16) - 16)
}
}
var n = this,
t = n.Function,
s = Object.keys ||
function(e) {
var a = {},
r = 0;
for (var c in e) a[r++] = c;
return a.length = r,
a
},
b = {},
k = {};
global = this;
global.navigator = {};
global.navigator.userAgent = "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36"; r(decodeURIComponent("gr%24Daten%20%D0%98b%2Fs!l%20y%CD%92y%C4%B9g%2C(lfi~ah%60%7Bmv%2C-n%7CjqewVxp%7Brvmmx%2C%26eff%7Fkx%5B!cs%22l%22.Pq%25widthl%22%40q%26heightl%22vr*getContextx%24%222d%5B!cs%23l%23%2C*%3B%3F%7Cu.%7Cuc%7Buq%24fontl%23vr(fillTextx%24%24%E9%BE%98%E0%B8%91%E0%B8%A0%EA%B2%BD2%3C%5B%23c%7Dl%232q*shadowBlurl%231q-shadowOffsetXl%23%24%24limeq%2BshadowColorl%23vr%23arcx88802%5B%25c%7Dl%23vr%26strokex%5B%20c%7Dl%22v%2C)%7DeOmyoZB%5Dmx%5B%20cs!0s%24l%24Pb%3Ck7l%20l!r%26lengthb%25%5El%241%2Bs%24j%02l%20%20s%23i%241ek1s%24gr%23tack4)zgr%23tac%24!%20%2B0o!%5B%23cj%3Fo%20%5D!l%24b%25s%22o%20%5D!l%22l%24b*b%5E0d%23%3E%3E%3Es!0s%25yA0s%22l%22l!r%26lengthb%3Ck%2Bl%22%5El%221%2Bs%22j%05l%20%20s%26l%26z0l!%24%20%2B%5B%22cs'(0l%23i'1ps9wxb%26s()%20%26%7Bs)%2Fs(gr%26Stringr%2CfromCharCodes)0s*yWl%20._b%26s%20o!%5D)l%20l%20Jb%3Ck%24.aj%3Bl%20.Tb%3Ck%24.gj%2Fl%20.%5Eb%3Ck%26i%22-4j!%1F%2B%26%20s%2ByPo!%5D%2Bs!l!l%20Hd%3E%26l!l%20Bd%3E%26%2Bl!l%20%3Cd%3E%26%2Bl!l%206d%3E%26%2Bl!l%20%26%2B%20s%2Cy%3Do!o!%5D%2Fq%2213o!l%20q%2210o!%5D%2Cl%202d%3E%26%20s.%7Bs-yMo!o!%5D0q%2213o!%5D*Ld%3Cl%204d%23%3E%3E%3Eb%7Cs!o!l%20q%2210o!%5D%2Cl!%26%20s%2FyIo!o!%5D.q%2213o!%5D%2Co!%5D*Jd%3Cl%206d%23%3E%3E%3Eb%7C%26o!%5D%2Bl%20%26%2B%20s0l-l!%26l-l!i'1z141z4b%2F%40d%3Cl%22b%7C%26%2Bl-l(l!b%5E%26%2Bl-l%26zl'g%2C)gk%7Dejo%7B%7Fcm%2C)%7Cyn~Lij~em%5B%22cl%24b%25%40d%3Cl%26zl'l%20%24%20%2B%5B%22cl%24b%25b%7C%26%2Bl-l%258d%3C%40b%7Cl!b%5E%26%2B%20q%24sign%20"), [TAC = {}]);
return TAC.sign(behot);
}
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