Angularjs实现搜索关键字高亮显示效果

$scope.myData = '<div>woshihight<h2>womei<b>bbb</b>shihigh<span>haha</span></h2><span>1000pxhight</span><ul><li>1high</li><li>2hight span light hight< p></li></ul><a href="index.html">这个是链接地址hight</a></div>';
 $scope.myDataCp = angular.copy($scope.myData);
 $scope.key = '';
 $scope.searchKey = function() {
 if($scope.key != '') {
 searchHighLight($scope.key);
 }
 }
 function searchHighLight(key) {
 var _element = angular.element($scope.myDataCp);
 nodeRecursion(_element[0],key);
 var _htmlStr = _element[0].innerHTML.toString();
 _htmlStr = _htmlStr.replace(/_1000px_/g, '<span class="red">').replace(/_xp0001_/g, '</span>');
 $scope.myData = _htmlStr;
 }
 //循环遍历替换所有文本节点内容
 function nodeRecursion(e, key) {
 var reg = new RegExp(key, 'g');
 var _count = e.childNodes.length;
 for(var _i=0; _i < _count; _i++) {
 if(e.childNodes.item(_i).nodeType == 3) {
 var _str = e.childNodes.item(_i).data;
 if(_str.indexOf(key)!=-1) {
 _str = _str.replace(reg,'_1000px_'+key+'_xp0001_');
 }
 e.childNodes.item(_i).data = _str;
 } else {
 nodeRecursion(e.childNodes.item(_i), key);
 }
 }
 }