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//3种字符：'+'、'['、']'
//从数字开始
+[]                            //0
++[+[]][+[]]                   //1
++[++[+[]][+[]]][+[]]          //2
++[++[++[+[]][+[]]][+[]]][+[]] //3
+[++[+[]][+[]]+[+[]]][+[]]     //10
//然后……
[][[]]                         //undefined
[[][[]]+[]][+[]][+[]]          //'u'
[[][[]]+[]][+[]][++[+[]][+[]]] //'n'
+[][[]]                        //NaN
[+[][[]]+[]][+[]][+[]]         //'N'
+[
    ++[+[]][+[]]+                                     //1
    [[][[]]+[]][+[]][++[++[++[+[]][+[]]][+[]]][+[]]]+ //'e'
    [++[+[]][+[]]][+[]]+                              //1
    [+[]][+[]]+                                       //0
    [+[]][+[]]+                                       //0
    [+[]][+[]]+                                       //0
][+[]] //Infinity
//然后……
[][
    [[][[]]+[]][+[]][++[++[++[++[+[]][+[]]][+[]]][+[]]][+[]]]+         //'f'
    [[][[]]+[]][+[]][++[++[++[++[++[+[]][+[]]][+[]]][+[]]][+[]]][+[]]]+//'i'
    [[][[]]+[]][+[]][++[+[]][+[]]]+                                    //'n'
    [[][[]]+[]][+[]][++[++[+[]][+[]]][+[]]]                            //'d'
]+[] //'function find(){ [native code] }'
//然后……
[]    //[] (Array)
+[]   //0  (Number)
[]+[] //'' (String)
[][
    [[][[]]+[]][+[]][++[++[++[++[+[]][+[]]][+[]]][+[]]][+[]]]+         //'f'
    [[][[]]+[]][+[]][++[++[++[++[++[+[]][+[]]][+[]]][+[]]][+[]]][+[]]]+//'i'
    [[][[]]+[]][+[]][++[+[]][+[]]]+                                    //'n'
    [[][[]]+[]][+[]][++[++[+[]][+[]]][+[]]]                            //'d'
]     //...(Function)
//然后……
[+[]][+[]]['constructor']
//就差一个S！！！