nl_tokens: Grant 去重
pl_tokens: function uniqGrant ( str ) { var arr = str . <mask> ( ',' ) ; var exist = { } ; var i , item ; for ( i = 0 ; i < arr . length ; ) { item = arr [ i ] . trim ( ) ; if ( exist [ item ] ) { arr . splice ( i , 1 ) ; } else { exist [ item ] = true ; arr [ i ] = item ; i ++ ; } } return arr . join ( ',' ) ; }