nl_tokens: 对字符串求值，对已双引号字符串，需要做变量替换
pl_tokens: function ( literal ) { var val = literal . <mask> ; var ret = val ; if ( literal . isEval && ( val . indexOf ( '#' ) !== - 1 || val . indexOf ( "$" ) !== - 1 ) ) { ret = this . evalStr ( val ) ; } return ret ; }