语法

Punctuator :: one of 
{ } ( ) [ ] 
.  ; , < > <= 
>= ==  != ===  !== 
+ - *  % ++ -- 
<< >> >>> & | ^  ! ~ && ||  ?  : 
= += -= *=  %= <<= 
>>= >>>= &= |= ^=

DivPunctuator :: one of 
/ /=