在做爬虫时，要打开DevTools分析网页结构和请求，但有的网站禁止鼠标右键或者禁止F12，不让你打开DevTools，还有的检测到你强行打开DevTools时就自动将网页关闭。下面是解决方法。
一.打开DevTools
有些网站禁止鼠标右键，要想打开DevTools，有以下几种方法：
- 按F12，有的网站只禁止鼠标右键，没禁止键盘F12
- 从浏览器右上角三个点里打开DevTools
- 装油猴脚本，有专门的脚本来绕过这个限制，鼠标右键就可以使用了；浏览器插件也行
- 浏览器里提前禁止js，如图1和图2，图中两种的任意一种就行，图1会禁止所有js
二.绕过网站的检测DevTools
现在DevTools能打开了，但有的网站会检测你是否打开了DevTools，如果打开了，则自动关闭网页。
目前我遇到的是，网站有个js文件专门做这个检测(文件名可能含有devtool)，当然也可能有其他方式，欢迎补充。那针对这种方式，绕过检测就是不让这个js执行，不过你得先找到它。如果你还有其他方法，欢迎补充。
找关键js文件
以下操作建议先打开DevTools，再进网站。
无论哪个方法，一次不行就多试几次。
方法一
给浏览器限制网速。
通过流量控制类软件，限制浏览器的网速(如图3)，例如1KB/s，让网页加载慢点，然后去DevTools的Network中找这个js，找的时候可以按文件名模糊搜索，可能的文件名在前文已写。
不过这种方法我试了好几次，我这Network和Fiddler都没看到这个js文件，但是别人能看到。
火绒、360都含有限速功能，其他软件也有，自己选择，测试完别忘了取消限速。
?
方法二
在网页被关闭前，快速点击DevTools的Sources中的暂停脚本执行按钮(如图4)，一定要快，然后去Network中找这个js。我试了好几次，Network中才有这个js。
?
方法三
?用Fiddler、Charles、Burp Suite甚至Wireshark等抓包软件进行抓包。我用过Fiddler和Burp Suite，Burp Suite可以控制每个请求forward(允许)还是drop(阻止)，Fiddler可能也能控制，我没试过不知道。Wireshark虽然也用过，但在这里不合适，原因在方法四。
这个网站我用了Fiddler，但如方法一所说，我没抓到这个js。
方法四
这个只是顺带一提，因为对多数人来说可行性不大。
如果你的路由器支持刷固件，且固件里有相应的功能；或者你的其他上层网络设备有相应的功能。这个功能其实就是日志，记录当前网络设备下的所有设备的所有请求和响应。有点类似Wireshark，Wireshark抓取流经物理网卡的所有流量，而这种方法抓取所有流经上层网络设备的流量，拓扑关系上比物理网卡高一级。
阻止执行js
无论测试什么，测试完别忘了取消阻止，防止以后其他网站也用这个URL，但它被你禁止了，导致网站加载异常，到时候不一定能想起来是以前禁止过。
方法一
文章开头图1和图2的方法。
方法二
DevTools的Network中，右键点击这个js，选阻止请求URL(如图5)，再刷新网页，网页就不会自动关闭了。
?以阻止百度为例，阻止后Network标签旁边有个黄色三角，里面有个叹号。还有两个地方也能看到被阻止的链接。如图6。
?关闭浏览器再打开，以前阻止过的链接也能在图6最下面的箭头处看到，看到的仅仅是以前阻止过的记录，本次(现在)并没有开启阻止。
方法三
手动复制js的链接，再在路由器、杀毒软件、广告过滤软件、广告过滤插件、抓包软件等任意能管理流量的地方，禁止访问这个链接，以后这个链接就永远访问不了了。
这个方法和方法二原理一样，不同的是，这个方法禁止的链接，永远访问不了。除非手动取消阻止，或重置硬件设置，或重置软件设置。
另外，如果你遇到很多网站都用js来检测你是否打开了DevTools，可以尝试找到这些js的链接的共同点，例如文件名或路径都有某些同样的字母等特征，再根据这些共同点提取出正则表达式或XPath语句或CSS选择器语句。然后本方法中不再是禁止具体的链接，而是禁止正则表达式或XPath语句或CSS选择器语句，这样以后只要是能被匹配的链接(或内容)，都会被禁止访问，前提是你用的硬件或软件支持正则表达式、XPath语句、CSS选择器语句。其实也不止这3种匹配方式，有的软件还支持更多匹配方式。
再强调一点，如果你用模糊匹配的方式，可能会误伤一些URL，看你写的匹配规则怎么样了。而且可能一时没有误伤，用了一段时间后，某天突然发现某网页加载不正常，这时候可能就是误伤了(希望此时你能想起来你以前写过匹配规则，不然就得花大量时间排查)，我最近就发现我几个月前写的XPath语句误伤了，不过我不是用来匹配这个js。
方法四
点击DevTools右上角的三个点，在单独窗口打开DevTools(如图7)，再打开网站，网站可能不会自动关闭，chrome、edge、火狐都试试，可能这个可以但那个就不行。我这还是会自动关闭，但别人可以。
方法五
如果你想在代码中实现绕过检测，试试mitmproxy，官网，官方GitHub，官方文档。如果你还有其他方法，欢迎补充。
方法六
我觉得在Console中应该也能手动hook这个js，但是不知道怎么做，有知道的请告诉我。
三.网站的js检测代码
我把我遇到的这个网站的js源码发出来，就是它检测到你强行打开DevTools时就自动将网页关闭。其他网站不一定跟这个一模一样。
未格式化
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var i = e[o] = {
i: o,
l: !1,
exports: {}
};
return n[o].call(i.exports, i, i.exports, t),
i.l = !0,
i.exports
}
return t.m = n,
t.c = e,
t.d = function(n, e, o) {
t.o(n, e) || Object.defineProperty(n, e, {
enumerable: !0,
get: o
})
},
t.r = function(n) {
"undefined" != typeof Symbol && Symbol.toStringTag && Object.defineProperty(n, Symbol.toStringTag, {
value: "Module"
}),
Object.defineProperty(n, "__esModule", {
value: !0
})
},
t.t = function(n, e) {
if (1 & e && (n = t(n)), 8 & e) return n;
if (4 & e && "object" == typeof n && n && n.__esModule) return n;
var o = Object.create(null);
if (t.r(o), Object.defineProperty(o, "default", {
enumerable: !0,
value: n
}), 2 & e && "string" != typeof n) for (var i in n) t.d(o, i,
function(e) {
return n[e]
}.bind(null, i));
return o
},
t.n = function(n) {
var e = n && n.__esModule ?
function() {
return n.
default
}:
function() {
return n
};
return t.d(e, "a", e),
e
},
t.o = function(n, e) {
return Object.prototype.hasOwnProperty.call(n, e)
},
t.p = "",
t(t.s = 0)
} ([function(n, e, t) {
"use strict";
function o(n) {
return - 1 !== navigator.userAgent.toLocaleLowerCase().indexOf(n)
}
t.r(e);
var i = function() {
try {
return window.self !== window.top
} catch(n) {
return ! 0
}
} (),
r = o("qqbrowser"),
u = o("firefox"),
c = o("macintosh"),
a = o("edge"),
l = a && !o("chrome") || o("trident") || o("msie"),
f = o("crios"),
d = o("edgios"),
v = {
UNKONW: -1,
REG_TO_STRING: 0,
DEFINE_ID: 1,
SIZE: 2,
DATE_TO_STRING: 3,
FUNC_TO_STRING: 4,
DEBUGGER: 5
};
var s = !1;
var w, p = {};
for (var y in v) p[v[y]] = !1;
function m(n) {
p[n] = !0
}
function b(n) {
p[n] = !1
}
function h() {
for (var n in p) if (p[n]) return s = !0,
!0;
return s = !1,
!1
}
function g() {
var n = function() {
if (T(window.devicePixelRatio)) return window.devicePixelRatio;
var n = window.screen;
if (T(n)) return ! 1;
if (n.deviceXDPI && n.logicalXDPI) return n.deviceXDPI / n.logicalXDPI;
return ! 1
} ();
if (!1 === n) return ! 0;
var e = v.SIZE,
t = window.outerWidth - window.innerWidth * n > 200,
o = window.outerHeight - window.innerHeight * n > 300;
return t || o ? (G(e), !1) : (b(e), !0)
}
function T(n) {
return null != n
}
function E(n) {
throw new Error('"' + n + '" is read-only')
}
function D(n, e, t) {
return e in n ? Object.defineProperty(n, e, {
value: t,
enumerable: !0,
configurable: !0,
writable: !0
}) : n[e] = t,
n
}
var I, _ = (D(w = {},
v.REG_TO_STRING, r || u), D(w, v.DEFINE_ID, !0), D(w, v.SIZE, !i && !a), D(w, v.DATE_TO_STRING, !f && !d), D(w, v.FUNC_TO_STRING, !f && !d), D(w, v.DEBUGGER, f || d), w);
function O(n, e, t) {
return e in n ? Object.defineProperty(n, e, {
value: t,
enumerable: !0,
configurable: !0,
writable: !0
}) : n[e] = t,
n
}
var S = (O(I = {},
v.REG_TO_STRING, (function() {
var n = v.REG_TO_STRING,
e = 0,
t = /./;
z(t),
t.toString = function() {
if (r) {
var t = (new Date).getTime();
e && t - e < 100 ? G(n) : e = t
} else u && G(n);
return ""
},
A(n, (function() {
z(t)
}))
})), O(I, v.DEFINE_ID, (function() {
var n = v.DEFINE_ID,
e = document.createElement("div");
e.__defineGetter__("id", (function() {
G(n)
})),
Object.defineProperty(e, "id", {
get: function() {
G(n)
}
}),
A(n, (function() {
z(e)
}))
})), O(I, v.SIZE, (function() {
g(),
window.addEventListener("resize", (function() {
setTimeout(g, 100)
}), !0)
})), O(I, v.DATE_TO_STRING, (function() {
var n = v.DATE_TO_STRING,
e = 0,
t = new Date;
t.toString = function() {
return e++,
""
},
A(n, (function() {
e = 0,
z(t),
X(),
e >= 2 && G(n)
}))
})), O(I, v.FUNC_TO_STRING, (function(n) {
if (!n) {
var e = v.FUNC_TO_STRING,
t = 0,
o = function() {};
o.toString = function() {
return t++,
""
};
A(e, (function() {
t = 0,
z(o),
X(),
t >= 2 && G(e)
}))
}
})), O(I, v.DEBUGGER, (function(n) {
if (n) {
var e = v.DEBUGGER;
A(e, (function() {
var n = Date.now();
Date.now() - n > 100 && G(e)
}))
}
})), I);
function N() { ("all" === F.detectors ? Object.keys(S) : F.detectors).forEach((function(n) { !
function(n, e) {
if ("function" == typeof e) {
var t = _[n];
void 0 === t ? (E("value"), t = !0) : "function" == typeof t && (E("value"), t = t()),
!0 === t && e()
}
} (n, S[n])
}))
}
function G() {
var n = arguments.length > 0 && void 0 !== arguments[0] ? arguments[0] : v.UNKONW;
console.warn("You ar not allow to use DEVTOOL! 【type = ".concat(n, "】")),
F.clearIntervalWhenDevOpenTrigger && L(),
U(),
F.ondevtoolopen(n, K),
m(n)
}
function R() {
if ("function" == typeof F.ondevtoolclose) {
var n = s; ! h() && n && F.ondevtoolclose()
}
}
var x = null,
j = null,
C = [],
P = 0;
function k() {
var n, e, t, o, i, r, u = !1,
c = function() {
u = !0
},
a = function() {
u = !1
};
n = c,
e = a,
t = window.alert,
o = window.confirm,
i = window.prompt,
r = function(t) {
return function() {
n && n(),
t.apply(void 0, arguments),
e && e()
}
},
window.alert = r(t),
window.confirm = r(o),
window.prompt = r(i),
function(n, e) {
var t, o, i;
void 0 !== document.hidden ? (t = "hidden", i = "visibilitychange", o = "visibilityState") : void 0 !== document.mozHidden ? (t = "mozHidden", i = "mozvisibilitychange", o = "mozVisibilityState") : void 0 !== document.msHidden ? (t = "msHidden", i = "msvisibilitychange", o = "msVisibilityState") : void 0 !== document.webkitHidden && (t = "webkitHidden", i = "webkitvisibilitychange", o = "webkitVisibilityState");
var r = function() {
document[o] === t ? e() : n()
};
document.removeEventListener(i, r, !1),
document.addEventListener(i, r, !1)
} (a, c),
x = window.setInterval((function() {
u || (C.forEach((function(n) {
var e = n.type,
t = n.handle;
b(e),
t(P++)
})), X(), R())
}), F.interval),
j = setTimeout((function() { / (iphone | ipad | ipod | ios | android) / i.test(navigator.userAgent.toLowerCase()) && L()
}), F.stopIntervalTime)
}
function A(n, e) {
C.push({
type: n,
handle: e
})
}
function L() {
window.clearInterval(x)
}
function U() {
window.clearTimeout(j)
}
function K() {
if (L(), F.url) window.location.href = F.url;
else {
try {
window.opener = null,
window.open("", "_self"),
window.close(),
window.history.back()
} catch(n) {
console.log(n)
}
setTimeout((function() {
window.location.href = "https://tackchen.gitee.io/404.html?h=".concat(encodeURIComponent(location.host))
}), 500)
}
}
function W(n) {
return (W = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ?
function(n) {
return typeof n
}: function(n) {
return n && "function" == typeof Symbol && n.constructor === Symbol && n !== Symbol.prototype ? "symbol": typeof n
})(n)
}
var F = {
md5: "",
ondevtoolopen: K,
ondevtoolclose: null,
url: "",
tkName: "ddtk",
interval: 200,
disableMenu: !0,
stopIntervalTime: 5e3,
clearIntervalWhenDevOpenTrigger: !1,
detectors: "all",
clearLog: !0,
disableSelect: !1,
disableCopy: !1,
disableCut: !1
},
H = ["detectors", "ondevtoolclose"];
function V() {
"function" == typeof F.ondevtoolclose && !0 === F.clearIntervalWhenDevOpenTrigger && (F.clearIntervalWhenDevOpenTrigger = !1, console.warn("【DISABLE-DEVTOOL】clearIntervalWhenDevOpenTrigger 在使用 ondevtoolclose 时无效"))
}
var M = window.console || {
log: function() {}
},
z = l ?
function() {
return M.log.apply(M, arguments)
}: M.log,
B = l ?
function() {
return M.clear()
}: M.clear;
function X() {
F.clearLog && B()
}
function Z() {
var n = 73,
e = 85,
t = 83,
o = 123,
i = c ?
function(e, t) {
return e.metaKey && e.altKey && t === n
}: function(e, t) {
return e.ctrlKey && e.shiftKey && t === n
},
r = c ?
function(n, o) {
return n.metaKey && n.altKey && o === e || n.metaKey && o === t
}: function(n, o) {
return n.ctrlKey && (o === t || o === e)
};
window.addEventListener("keydown", (function(n) {
var e = (n = n || window.event).keyCode || n.which;
if (e === o || i(n, e) || r(n, e)) return n.returnValue = !1,
n.preventDefault(),
!1
}), !0),
F.disableMenu && q(window, "contextmenu"),
F.disableSelect && q(window, "selectstart"),
F.disableCopy && q(window, "copy"),
F.disableCut && q(window, "cut")
}
function q(n, e) {
n.addEventListener(e, (function(n) {
return (n = n || window.event).returnValue = !1,
n.preventDefault(),
!1
}))
}
function Y(n, e, t, o, i, r) {
return en((u = en(en(e, n), en(o, r))) << (c = i) | u >>> 32 - c, t);
var u, c
}
function $(n, e, t, o, i, r, u) {
return Y(e & t | ~e & o, n, e, i, r, u)
}
function J(n, e, t, o, i, r, u) {
return Y(e & o | t & ~o, n, e, i, r, u)
}
function Q(n, e, t, o, i, r, u) {
return Y(e ^ t ^ o, n, e, i, r, u)
}
function nn(n, e, t, o, i, r, u) {
return Y(t ^ (e | ~o), n, e, i, r, u)
}
function en(n, e) {
var t = (65535 & n) + (65535 & e);
return (n >> 16) + (e >> 16) + (t >> 16) << 16 | 65535 & t
}
var tn = function(n) {
return function(n) {
for (var e = "0123456789abcdef",
t = "",
o = 0; o < 4 * n.length; o++) t += e.charAt(n[o >> 2] >> o % 4 * 8 + 4 & 15) + e.charAt(n[o >> 2] >> o % 4 * 8 & 15);
return t
} (function(n, e) {
n[e >> 5] |= 128 << e % 32,
n[14 + (e + 64 >>> 9 << 4)] = e;
for (var t = 1732584193,
o = -271733879,
i = -1732584194,
r = 271733878,
u = 0; u < n.length; u += 16) {
var c = t,
a = o,
l = i,
f = r;
t = $(t, o, i, r, n[u + 0], 7, -680876936),
r = $(r, t, o, i, n[u + 1], 12, -389564586),
i = $(i, r, t, o, n[u + 2], 17, 606105819),
o = $(o, i, r, t, n[u + 3], 22, -1044525330),
t = $(t, o, i, r, n[u + 4], 7, -176418897),
r = $(r, t, o, i, n[u + 5], 12, 1200080426),
i = $(i, r, t, o, n[u + 6], 17, -1473231341),
o = $(o, i, r, t, n[u + 7], 22, -45705983),
t = $(t, o, i, r, n[u + 8], 7, 1770035416),
r = $(r, t, o, i, n[u + 9], 12, -1958414417),
i = $(i, r, t, o, n[u + 10], 17, -42063),
o = $(o, i, r, t, n[u + 11], 22, -1990404162),
t = $(t, o, i, r, n[u + 12], 7, 1804603682),
r = $(r, t, o, i, n[u + 13], 12, -40341101),
i = $(i, r, t, o, n[u + 14], 17, -1502002290),
o = $(o, i, r, t, n[u + 15], 22, 1236535329),
t = J(t, o, i, r, n[u + 1], 5, -165796510),
r = J(r, t, o, i, n[u + 6], 9, -1069501632),
i = J(i, r, t, o, n[u + 11], 14, 643717713),
o = J(o, i, r, t, n[u + 0], 20, -373897302),
t = J(t, o, i, r, n[u + 5], 5, -701558691),
r = J(r, t, o, i, n[u + 10], 9, 38016083),
i = J(i, r, t, o, n[u + 15], 14, -660478335),
o = J(o, i, r, t, n[u + 4], 20, -405537848),
t = J(t, o, i, r, n[u + 9], 5, 568446438),
r = J(r, t, o, i, n[u + 14], 9, -1019803690),
i = J(i, r, t, o, n[u + 3], 14, -187363961),
o = J(o, i, r, t, n[u + 8], 20, 1163531501),
t = J(t, o, i, r, n[u + 13], 5, -1444681467),
r = J(r, t, o, i, n[u + 2], 9, -51403784),
i = J(i, r, t, o, n[u + 7], 14, 1735328473),
o = J(o, i, r, t, n[u + 12], 20, -1926607734),
t = Q(t, o, i, r, n[u + 5], 4, -378558),
r = Q(r, t, o, i, n[u + 8], 11, -2022574463),
i = Q(i, r, t, o, n[u + 11], 16, 1839030562),
o = Q(o, i, r, t, n[u + 14], 23, -35309556),
t = Q(t, o, i, r, n[u + 1], 4, -1530992060),
r = Q(r, t, o, i, n[u + 4], 11, 1272893353),
i = Q(i, r, t, o, n[u + 7], 16, -155497632),
o = Q(o, i, r, t, n[u + 10], 23, -1094730640),
t = Q(t, o, i, r, n[u + 13], 4, 681279174),
r = Q(r, t, o, i, n[u + 0], 11, -358537222),
i = Q(i, r, t, o, n[u + 3], 16, -722521979),
o = Q(o, i, r, t, n[u + 6], 23, 76029189),
t = Q(t, o, i, r, n[u + 9], 4, -640364487),
r = Q(r, t, o, i, n[u + 12], 11, -421815835),
i = Q(i, r, t, o, n[u + 15], 16, 530742520),
o = Q(o, i, r, t, n[u + 2], 23, -995338651),
t = nn(t, o, i, r, n[u + 0], 6, -198630844),
r = nn(r, t, o, i, n[u + 7], 10, 1126891415),
i = nn(i, r, t, o, n[u + 14], 15, -1416354905),
o = nn(o, i, r, t, n[u + 5], 21, -57434055),
t = nn(t, o, i, r, n[u + 12], 6, 1700485571),
r = nn(r, t, o, i, n[u + 3], 10, -1894986606),
i = nn(i, r, t, o, n[u + 10], 15, -1051523),
o = nn(o, i, r, t, n[u + 1], 21, -2054922799),
t = nn(t, o, i, r, n[u + 8], 6, 1873313359),
r = nn(r, t, o, i, n[u + 15], 10, -30611744),
i = nn(i, r, t, o, n[u + 6], 15, -1560198380),
o = nn(o, i, r, t, n[u + 13], 21, 1309151649),
t = nn(t, o, i, r, n[u + 4], 6, -145523070),
r = nn(r, t, o, i, n[u + 11], 10, -1120210379),
i = nn(i, r, t, o, n[u + 2], 15, 718787259),
o = nn(o, i, r, t, n[u + 9], 21, -343485551),
t = en(t, c),
o = en(o, a),
i = en(i, l),
r = en(r, f)
}
return Array(t, o, i, r)
} (function(n) {
for (var e = Array(), t = 0; t < 8 * n.length; t += 8) e[t >> 5] |= (255 & n.charCodeAt(t / 8)) << t % 32;
return e
} (n), 8 * n.length))
};
function on(n) { !
function() {
var n = arguments.length > 0 && void 0 !== arguments[0] ? arguments[0] : {};
for (var e in F) void 0 === n[e] || W(F[e]) !== W(n[e]) && -1 === H.indexOf(e) || (F[e] = n[e]);
V()
} (n),
function() {
if (F.md5) {
var n = function(n) {
var e = window.location.search,
t = window.location.hash;
if ("" === e && "" !== t && (e = "?".concat(t.split("?")[1])), "" !== e && void 0 !== e) {
var o = new RegExp("(^|&)" + n + "=([^&]*)(&|$)", "i"),
i = e.substr(1).match(o);
if (null != i) return unescape(i[2])
}
return ""
} (F.tkName);
if (tn(n) === F.md5) return ! 0
}
return ! 1
} () || (k(), Z(), N())
}
on.md5 = tn,
on.version = "0.2.5",
on.DETECTOR_TYPE = v,
on.isDevToolOpened = h,
function() {
if ("undefined" != typeof document) {
var n = document.querySelector("[disable-devtool-auto]");
if (n) {
var e = {}; ["md5", "url", "tk-name", "interval", "disable-menu", "detectors"].forEach((function(t) {
var o = n.getAttribute(t);
null !== o && ("interval" === t ? o = parseInt(o) : "disable-menu" === t ? o = "false" !== o: "detector" === t && "all" !== o && (o = o.split(" ")), e[function(n) {
if ( - 1 === n.indexOf("-")) return n;
var e = !1;
return n.split("").map((function(n) {
return "-" === n ? (e = !0, "") : e ? (e = !1, n.toUpperCase()) : n
})).join("")
} (t)] = o)
})),
on(e)
}
}
} ();
e.
default = on
}]).
default
}));四.感谢
本文中一些方法由几位热心网友提供，感谢他们的帮助！