- CHILD: function(elem, match){
- var type = match[1], parent = elem.parentNode;
-
- var doneName = match[0];
-
- if ( parent && !parent[ doneName ] ) {
- var count = 1;
-
- for ( var node = parent.firstChild; node; node = node.nextSibling ) {
- if ( node.nodeType == 1 ) {
- node.nodeIndex = count++;
- }
- }
-
- parent[ doneName ] = count - 1;
- }
-
- if ( type == "first" ) {
- return elem.nodeIndex == 1;
- } else if ( type == "last" ) {
- return elem.nodeIndex == parent[ doneName ];
- } else if ( type == "only" ) {
- return parent[ doneName ] == 1;
- } else if ( type == "nth" ) {
- var add = false, first = match[2], last = match[3];
-
- if ( first == 1 && last == 0 ) {
- return true;
- }
-
- if ( first == 0 ) {
- if ( elem.nodeIndex == last ) {
- add = true;
- }
- } else if ( (elem.nodeIndex - last) % first == 0 && (elem.nodeIndex - last) / first >= 0 ) {
- add = true;
- }
-
- return add;
- }
- },