// 注意，在Chrome瀏覽器中打印

[[][0] + []][0][5]+[[][[[][0] + []][0][4]+[[][0] + []][0][5]+[[][0] + []][0][1]+[[][0] + []][0][2]] + []][0][8]+[[[] == []][0] + []][0][2]+[[][[[][0] + []][0][4]+[[][0] + []][0][5]+[[][0] + []][0][1]+[[][0] + []][0][2]] + []][0][6]+[[][[[][0] + []][0][4]+[[][0] + []][0][5]+[[][0] + []][0][1]+[[][0] + []][0][2]]+[]][0][23]+[[][0] + []][0][3]+[[][[[][0] + []][0][4]+[[][0] + []][0][5]+[[][0] + []][0][1]+[[][0] + []][0][2]] + []][0][8]+[+[1 + [[][0] + []][0][3] +309][0] + []][0][7]+[[][[[][0] + []][0][4]+[[][0] + []][0][5]+[[][0] + []][0][1]+[[][0] + []][0][2]] + []][0][6]+[[][0] + []][0][0]
//執行完的結果很神奇的是一段話
//"i love you"

親測了一下，不得不感嘆js的神奇，于是去探究其中的原理，就會發現充分運用了JavaScript 隱式類型轉換原理。

可以任意輸出數字

let zero = +[];//0
let one = +(![]==![]);//1
let two = +(![]==![])+(![]==![]);//one+one=2
let three = +(![]==![])+(![]==![])+(![]==![]);//one+one+one=3
let four = +(![]==![])+(![]==![])+(![]==![])+(![]==![]);//one+one+one+one+one=4
let five = +(![]==![])+(![]==![])+(![]==![])+(![]==![])+(![]==![]);//one+one+one+one+one=5
let ten = +(+(![]==![])+[]+(+[]));//10
let hundred = +(+(![]==![])+[]+(+[]))*+(+(![]==![])+[]+(+[]));//ten*ten=100
let thousand = +(+(![]==![])+[]+(+[]))*+(+(![]==![])+[]+(+[]))*+(+(![]==![])+[]+(+[]));//ten*hundred=1000

最初的字母來源

let voidStr = []+[];
//""
let trueStr = (![]==![])+[];
//"true"
let falseStr = ([]==[])+[];
//"false"
let undefinedStr = [][+[]]+[];
//"undefined"
let nanStr = +[][+[]]+[];
//"NaN"
//["true"][0][3]獲得字母e

Infinity

//[]+one+[trueStr][zero][three]+three+zero+(ten-one) = "1e309"
let InfinityNum = []+(+(![]==![]))+[(![]==![])+[]][+[]][+(![]==![])+(![]==![])+(![]==![])]+(+(![]==![])+(![]==![])+(![]==![]))+(+[])+(+(+(![]==![])+[]+(+[]))-(+(![]==![])));//"1e309"
//+("1e309")轉成數字后，相當于 1 乘以 10 的 309 次方，大于 JavaScript 最大的數，所以結果會是 Infinity
//+(InfinityNum)+[]="Infinity"
let InfinityStr = +([]+(+(![]==![]))+[(![]==![])+[]][+[]][+(![]==![])+(![]==![])+(![]==![])]+(+(![]==![])+(![]==![])+(![]==![]))+(+[])+(+(+(![]==![])+[]+(+[]))-(+(![]==![]))))+[];
//"Infinity"

Function

//[]["find"]會顯示數組的find函數，結果為：function find() { [native code] }
//[undefinedStr][zero][four]+[undefinedStr][zero][five]+[undefinedStr][zero][ten-four]+[undefinedStr][zero][two] = "find"
let funStr = [][ [[][+[]]+[]][+[]][+(![]==![])+(![]==![])+(![]==![])+(![]==![])] + [[][+[]]+[]][+[]][+(![]==![])+(![]==![])+(![]==![])+(![]==![])+(![]==![])] + [[][+[]]+[]][+[]][+(+(![]==![])+[]+(+[]))-(+(![]==![])+(![]==![])+(![]==![])+(![]==![]))] + [[][+[]]+[]][+[]][+(![]==![])+(![]==![])]]+[];
//"function find() { [native code] }"

constructor

//constructor 是一個神奇的屬性，因為通過它，我們可以獲得各種類型的值對象的構造函數！
//[funStr][zero][three]+[funStr][zero][ten-four]+[undefinedStr][zero][one]+[falseStr][zero][three]+[trueStr][zero][zero]+[trueStr][zero][one]+[trueStr][zero][two]+[funStr][zero][three]+[trueStr][zero][zero]+[funStr][zero][ten-four]+[trueStr][zero][one] = constructor
let constructorStr = [ [][ [[][+[]]+[]][+[]][+(![]==![])+(![]==![])+(![]==![])+(![]==![])] + [[][+[]]+[]][+[]][+(![]==![])+(![]==![])+(![]==![])+(![]==![])+(![]==![])] + [[][+[]]+[]][+[]][+(+(![]==![])+[]+(+[]))-(+(![]==![])+(![]==![])+(![]==![])+(![]==![]))] + [[][+[]]+[]][+[]][+(![]==![])+(![]==![])]]+[] ][+[]][+(![]==![])+(![]==![])+(![]==![])] +
                        [ [][ [[][+[]]+[]][+[]][+(![]==![])+(![]==![])+(![]==![])+(![]==![])] + [[][+[]]+[]][+[]][+(![]==![])+(![]==![])+(![]==![])+(![]==![])+(![]==![])] + [[][+[]]+[]][+[]][+(+(![]==![])+[]+(+[]))-(+(![]==![])+(![]==![])+(![]==![])+(![]==![]))] + [[][+[]]+[]][+[]][+(![]==![])+(![]==![])]]+[] ][+[]][ +(+(![]==![])+[]+(+[])) - (+(![]==![])+(![]==![])+(![]==![])+(![]==![])) ] +
                        [ [][+[]]+[] ][+[]][+(![]==![])] +
                        [ ([]==[])+[] ][+[]][+(![]==![])+(![]==![])+(![]==![])] +
                        [ (![]==![])+[] ][+[]][+[]] +
                        [ (![]==![])+[] ][+[]][+(![]==![])] +
                        [ (![]==![])+[] ][+[]][+(![]==![])+(![]==![])] +
                        [ [][ [[][+[]]+[]][+[]][+(![]==![])+(![]==![])+(![]==![])+(![]==![])] + [[][+[]]+[]][+[]][+(![]==![])+(![]==![])+(![]==![])+(![]==![])+(![]==![])] + [[][+[]]+[]][+[]][+(+(![]==![])+[]+(+[]))-(+(![]==![])+(![]==![])+(![]==![])+(![]==![]))] + [[][+[]]+[]][+[]][+(![]==![])+(![]==![])]]+[] ][+[]][+(![]==![])+(![]==![])+(![]==![])] +
                        [ (![]==![])+[] ][+[]][+[]] +
                        [ [][ [[][+[]]+[]][+[]][+(![]==![])+(![]==![])+(![]==![])+(![]==![])] + [[][+[]]+[]][+[]][+(![]==![])+(![]==![])+(![]==![])+(![]==![])+(![]==![])] + [[][+[]]+[]][+[]][+(+(![]==![])+[]+(+[]))-(+(![]==![])+(![]==![])+(![]==![])+(![]==![]))] + [[][+[]]+[]][+[]][+(![]==![])+(![]==![])]]+[] ][+[]][ +(+(![]==![])+[]+(+[])) - (+(![]==![])+(![]==![])+(![]==![])+(![]==![])) ] +
                        [ (![]==![])+[] ][+[]][+(![]==![])];
 // "constructor"
//0["constructor"] => function Number() { [native code] } 可以獲取字母m，g

toString

constructor 可是一個神奇的屬性，因為通過它，我們可以獲得各種類型的值對象的構造函數！

//0["constructor"] // function Number() { [native code] }
""["constructor"] // function String() { [native code] }
//"to" + ""["constructor"]["name"] => "toString"

toString 這個方法可以表示出 26個 字母!

NumberObject.toString(radix)

radix：表示數字的基數，使 2 ~ 36 之間的整數。若省略該參數，則使用基數 10。但是要注意，如果該參數是 10 以外的其他值，則 ECMAScript 標準允許實現返回任意值

10['toString'](36)
//a
35['toString'](36)
//Z