nl_tokens: 根据选择器查询目标元素
pl_tokens: function <mask> ( selector ) { var container = arguments . length > 1 && arguments [ 1 ] !== undefined ? arguments [ 1 ] : document ; var toArray = arguments [ 2 ] ; var retNodeList = container . querySelectorAll ( selector ) ; return toArray ? _Array$from ( retNodeList ) : retNodeList ; }