回學(xué)校答辯一周，又回來了開始日更。
今天是一題簡單題，因為只要把網(wǎng)頁中的內(nèi)容在瀏覽器的console中運行一下即可，詳細步驟如下：
1、打開網(wǎng)站，逼死強迫癥：
2、按F12打開控制臺，復(fù)制進去運行，即可出結(jié)果，啊舒服：
總不能就這樣結(jié)束了吧，看一下原理吧：
參考致謝：
http://www.anquan.us/static/drops/web-4410.html
https://www.freebuf.com/sectool/5352.html
什么是jother編碼：
jother編碼是一種運用JavaScript中少量字符對于字符串進行的編碼方式。其中少量字符包括：
"!"、"+"、"("、")"、"["、"]"、"{"、"}"
是不是很神奇，如果只用這些個字符的話，就可以繞過很多的檢查，進行攻擊或者偷取數(shù)據(jù)。比如如果只檢查是不是有英文字母，那就構(gòu)造alert(document.cookie)等，或者進行XSS攻擊。黑客想象力是無窮的~
那我們從頭看起：
1、如果有一個代碼是：
alert([]);
運行會出現(xiàn)什么呢？不錯，只是一個空框，因為括號中并無任何內(nèi)容。
但是如果改成：
alert(+[]);
會出現(xiàn)什么呢？彈出一個0歐，不信試一下，這是因為“+”運算符對于無法顯示出來的空（void）的函數(shù)返回值進行了強制類型轉(zhuǎn)換，將其轉(zhuǎn)為了整形的“0”。
2、那怎么生成1呢？
如果將代碼改成:
alert(![]);
"false"!，因為“！”將其變?yōu)椴紶栃?，既然有了這個，那再轉(zhuǎn)為true吧，再加一個“！”
alert(!![]);
3、“1”是不是近在眼前，沒錯，就是這樣的，先轉(zhuǎn)為布爾型，再用“+”強轉(zhuǎn)：
alert(+!![]);
4、既然這樣，那么整數(shù)我們都可以得到，后面只需要不斷地加：
"+[]", //0
"+!![]", //1
"!![]+!![]", //2
"!![]+!![]+!![]", //3
"!![]+!![]+!![]+!![]", //4
"!![]+!![]+!![]+!![]+!![]", //5
"!![]+!![]+!![]+!![]+!![]+!![]", //6
"!![]+!![]+!![]+!![]+!![]+!![]+!![]", //7
"!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]", //8
"!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]" //9
5、新的問題出現(xiàn)了，那么怎么得到字符呢？
（1）數(shù)字轉(zhuǎn)為ASCII碼轉(zhuǎn)成字符，既然有數(shù)字，可以當(dāng)成ASCII碼，但是如何轉(zhuǎn)換成字符又是一個問題。那換一種思路。
（2）數(shù)組，因為我們現(xiàn)在有true和false，emmm九個字符，我們可以先提取這里面的就個字符。比如要“a”，就從false中提取吧：
alert((![])[+!![]]);
解碼當(dāng)然就是alert(false[1])了，但是并不是，因為false是一個布爾類型的，因此會輸出一個“undefined”，首先要將它轉(zhuǎn)換為字符串類型，
![]+[]
是因為“+”將布爾類型強轉(zhuǎn)為了字符串類型，可以使用typeof進行測試：
alert(typeof(![]+[]));
那么這樣我們就可以提取“a”：
alert((![]+[])[+!![]]);
同樣的方法，可以提取到九個字符了吧。但是畢竟還有很多字符，于是要再擴充字典，還記得剛才那個“undefined”嗎，把它也提取了!
6、繼續(xù)擴展，使用“{}”
如下代碼：
alert({});
會出現(xiàn)一個“[object Object]”，把它也變成字符串類型，使用
{}+[]
于是可以提取“o”出來:
alert(({}+[])[+!![]]);
哈哈，a、e、i、o、u都有了吧，但這不是重點，要o主要是為了要sort函數(shù)。
7、這里還有一個我暫時不知道的概念，叫javascript匿名函數(shù)，埋個坑，下次有空填。
javascript匿名函數(shù)的原生形式如下：
[]['sort']['constructor']('函數(shù)體')();
可以這樣構(gòu)造來執(zhí)行任意JavaScript代碼，當(dāng)我們在上一步獲取了“true”、“false”、“undefined”、“[object Object]”（甚至還有一個重要的空格字符），比較一下剛才的函數(shù)，是不是所有字符我們都有了，太神奇了吧！?。?br> 于是構(gòu)造函數(shù)獲取瀏覽器正在訪問的地址：
[][(![]+[])[!![]+!![]+!![]]+({}+[])[+!![]]+(!![]+[])[+!![]]+(!![]+[])[+[]]][({}+[])[!![]+!![]+!![]+!![]+!![]]+({}+[])[+!![]]+({}[[]]+[])[+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+({}[[]]+[])[+[]]+({}+[])[!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+[]]+({}+[])[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+[]]+({}[[]]+[])[+[]]+(!![]+[])[+!![]]+({}[[]]+[])[+!![]]+({}+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!![]+!![]]+({}+[])[+!![]]+({}+[])[!![]+!![]+!![]+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+[]]+({}[[]]+[])[!![]+!![]+!![]+!![]+!![]]+({}+[])[+!![]]+({}[[]]+[])[+!![]])()
等價于：
[]['sort']['constructor']('return location')()
return后面的空格怎么得到的，剛才說的還記得嗎？
8、剛才一步獲取瀏覽器地址后可以在http中得到p，那么就可以使用escape函數(shù)加密和unescape解密獲得新字符啦，這里再挖個坑，有空看一下escape和unescape。
9、最后一問，如何縮短編碼，其實還是有些辦法的，可以指替換部分代碼。比如可以利用jother重新編碼函數(shù)，用匿名函數(shù)調(diào)用“alert”，在調(diào)用“alert”的時候僅替換alert中的r，這樣就形成了“ale”+xxx（jother）+“t”的形式。
10、試試我的函數(shù)彩蛋吧，嘻嘻嘻：
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