When crawling, you need to open DevTools to analyze the web page structure and requests, but some websites prohibit the right mouse button or F12 from opening DevTools, and some websites automatically close the webpage when they detect that you forcibly open DevTools. Below is the workaround.
1. Open DevTools
Some websites prohibit the right mouse button. To open DevTools, there are several methods:
- Press F12, some websites only prohibit the right mouse button, but do not prohibit the keyboard F12
- Open DevTools from the three dots in the upper right corner of the browser
- Install the oil monkey script, there is a special script to bypass this limitation, you can use it with the right mouse button; browser plug-ins are also available
- Prohibit js in advance in the browser, as shown in Figure 1 and Figure 2, any one of the two in the figure will do, and Figure 1 will prohibit all js
2. Bypass the website detection DevTools
Now DevTools can be opened, but some websites will detect whether you have opened DevTools, and if it is opened, the webpage will be automatically closed.
At present, what I have encountered is that there is a js file on the website dedicated to this detection (the file name may contain devtool ), of course, there may be other ways, welcome to add. For this method, bypassing detection means not allowing this js to execute, but you have to find it first. If you have other methods, welcome to add.
Find the key js file
For the following operations, it is recommended to open DevTools first, and then enter the website.
No matter which method, if it doesn't work once, try it several times.
method one
Limit the internet speed of the browser.
Use flow control software to limit the browser's network speed (as shown in Figure 3), such as 1KB/s, so that the webpage loads slowly, and then go to the DevTools Network to find this js. When looking for it, you can fuzzy search by file name, maybe The file name has been written above.
However, I have tried this method several times. Neither my Network nor Fiddler can see this js file, but others can.
Both Huorong and 360 have speed limit functions, and other software also have speed limit functions. You can choose by yourself. Don’t forget to cancel the speed limit after testing.
Update, the browser has its own speed limit ( reference link ). The purpose of keeping the log is checked here to prevent this js from being caught.
Method Two
Before the web page is closed, quickly click the Pause Script Execution button in Sources of DevTools (as shown in Figure 4), be sure to be fast, and then go to the Network to find this js. I tried several times, and this js is only available in the Network.
method three
Use packet capture software such as Fiddler, Charles, Burp Suite, or even Wireshark to capture packets. I have used Fiddler and Burp Suite. Burp Suite can control each request forward (allow) or drop (block). Fiddler may also be able to control it. I haven't tried it and don't know. Although Wireshark has also been used, it is not suitable here because of method four.
I used Fiddler for this website, but as mentioned in Method 1, I did not catch this js.
Method four
This is just a passing mention, because it is not feasible for most people.
If your router supports flashing firmware, and there are corresponding functions in the firmware; or your other upper-level network devices have corresponding functions. This function is actually a log, which records all requests and responses of all devices under the current network device. A bit similar to Wireshark, Wireshark captures all the traffic flowing through the physical network card, and this method captures all the traffic flowing through the upper-layer network device, and the topological relationship is one level higher than the physical network card.
prevent the execution of js
No matter what you are testing, don’t forget to unblock it after the test to prevent other websites from using this URL in the future, but it is banned by you, causing the website to load abnormally, and you may not remember that it was banned before.
method one
The method of Figure 1 and Figure 2 at the beginning of the article.
Method Two
In the Network of DevTools, right-click the js, select Block Request URL (as shown in Figure 5), and then refresh the webpage, the webpage will not be closed automatically.
Take blocking Baidu as an example. After blocking, there will be a yellow triangle next to the Network label with an exclamation mark inside. There are two other places where blocked links can also be seen. Figure 6.
Close the browser and open it again, the previously blocked links can also be seen at the bottom arrow in Figure 6. What you see is only the previously blocked records, and this time (now) the blocking is not enabled.
method three
Manually copy the js link, and then prohibit access to this link in any place that can manage traffic, such as routers, anti-virus software, ad filtering software, ad filtering plug-ins, packet capture software, etc., and this link will never be accessible in the future.
This method is the same as method 2, the difference is that links prohibited by this method will never be accessed. Unless manually unblocked, or reset hardware settings, or reset software settings.
In addition, if you encounter many websites that use js to detect whether you have opened DevTools, you can try to find the common points of these js links, for example, the file name or path has certain characteristics such as the same letter, and then based on these common points Extract regular expressions or XPath statements or CSS selector statements. Then this method is no longer prohibiting specific links, but prohibiting regular expressions or XPath statements or CSS selector statements, so that as long as it is a link (or content) that can be matched in the future, it will be prohibited from accessing, provided that you use The hardware or software supports regular expressions, XPath statements, and CSS selector statements. In fact, there are more than these three matching methods, and some software supports more matching methods.
Again, if you use fuzzy matching, you may accidentally damage some URLs, depending on the matching rules you wrote. And there may be no accidental injury for a while. After using it for a while, one day I suddenly found that a certain web page was not loaded normally. ), I recently discovered that the XPath statement I wrote a few months ago was accidentally injured, but I was not using it to match this js.
Method four
Click the three dots in the upper right corner of DevTools, open DevTools in a separate window (as shown in Figure 7), and then open the website, the website may not be closed automatically, try chrome, edge, and Firefox, maybe this one works but that one doesn’t. Mine will still automatically close, but others can.
Method five
If you want to bypass detection in your code, try mitmproxy, official website , official GitHub , official documentation . If you have other methods, welcome to add.
method six
I think it should be possible to manually hook this js in the Console, but I don’t know how to do it, please let me know if you know.
3. The js detection code of the website
I sent out the js source code of the website I encountered, that is, when it detects that you forcibly open DevTools, it will automatically close the webpage. Other sites don't have to be exactly like this one.
unformatted
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!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
}));4. Thanks
Some methods in this article are provided by several enthusiastic netizens, thank them for their help!