先看代碼，請相信自己的眼睛！這确實是段代碼！
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+[])[+!+[]]]()[+!+[]+[!+[]+!+[]]])()) 看到這裡，你是否眼花缭亂，沒有頭緒呢？隻用 []()!+ 這六個字元就可以實作一段可執行的 JavaScipt 代碼，這是如何實作的呢？
類型轉換
JavaScript 是弱類型的程式設計語言，我們在寫代碼的時候充斥着大量的類型轉換，如下表：
根據資料類型轉換：
!後的字元會被轉換為布爾值
//false
![]
//true
!![]
//undefined
[][[]]
//NaN
+[![]] +後的字元會被轉換為數值
//結果是什麼呢？提示：[]被轉換為0
+[] === 0 //結果是什麼呢？提示：[]被轉換為0,!0是true,+true是1
+!+[] === 1
//結果是什麼呢？
[+!+[]] + [+[]]] === [1]+[0] === '10' +[] 前的字元會被轉換為字元串
//結果是什麼呢？
!+[]+!+[] === 2 思考1
//1.提示：+[]被轉換為0，[][0]為undefined
[][ +[] ] === undefined
//2.提示：false +[]為'false',[+!![]]為1，是以結果為a——擴充後可以擷取到想要的字母
(false +[]) [+!![]] === 'a'
//3.提示：0["constructor"]為Number,Number+[]轉為字元串"function Number(){}"
0["constructor"]+[]
//4.提示：通過 []["find"] 可以拿到數組的 find 方法，find 方法的構造函數其實就是 Function
[]["find"]["constructor"] === Function 思考2
根據以上内容推導：
//1.表示f
(![]+[])[+[]]
//2.表示find
(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+([][[]]
+[])[!+[]+!+[]]
//3.表示constructor
([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]
]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![
]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[
])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+
([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]
]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])
[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])
[+!+[]]
//4.表示alert
(![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+
[])[+!+[]]+(!![]+[])[+[]]
//5.表示 []["find"]["constructor"]("alert(1)")()：
[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]
[([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]
]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(!
[]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+
[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]
+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]
]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+(![]+[]
)[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[+!+[]+[+[]]]+(!![]+[])
[+!+[]]]((![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+(!![]+[])[!+[]+!+[]+!+[
]]+(!![]+[])[+!+[]]+(!![]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!
+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[+!+[]+[!+[]+!+[]+!+[]]]+[+!
+[]]+([+[]]+![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]
+(!![]+[])[+[]]])[!+[]+!+[]+[+[]]])()