我在walker类的基础上取得了一些进展，但由于wordpress似乎没有以与子节点相同的方式处理分类树的根节点，因此我还没有让ti完全按照需要工作。

因此，它会修剪结束菜单项，但如果该节点的父节点是根级别的节点，则会修剪该节点并留下一个空的ul元素，<ul></ul>. 在子节点上修复此问题的代码不适用于根节点，导致整个结构扁平化，没有子菜单

class Post_Category_Walker extends Walker_Category {

    private $term_ids = array();
    function __construct( /*$post_id,*/ $taxonomy )  {
        // fetch the list of term ids for the given post
        $this->taxterms = get_terms( $taxonomy);
        $this->noshow = array();
    }
    function isdisplayable( $element, &$children_elements, $args ){
        $id = $element->term_id;
        if(in_array($element->term_id, $this->noshow)){
            return false;
        }
        $display = true;
        if($element->parent != 0){
            $display = false;
            if ( isset( $children_elements[ $id ] ) ) {
                $display = true;
            }
        }
        if($depth == 0){
            $display = true;
        }
        return $display;
    }
    function hasChildren( $element/*, &$children_elements*/){
        foreach($this->taxterms as $term){
            if($term->parent == $element->term_id){
                return true;
            }
        }
        return false;//(isset($children_elements[$element->term_id]));
    }
    function display_element( $element, &$children_elements, $max_depth, $depth=0, $args, &$output ) {
        $display = $this->isdisplayable( $element, $children_elements, $args );
        $id = $element->term_id;
        if($element->parent != 0){

            if($this->hasChildren($element)){ //isset( $children_elements[ $id ] ) ) {
                $endnode = true;
                //print_r($children_elements[ $id ]);
                foreach($this->taxterms as $child){
                    if($child->parent == $element->term_id){
                        if($this->hasChildren($child)){
                            $endnode = false;
                            break;
                        }
                    }
                }
                if($endnode == true){
                    //$children_elements = NULL;
                    unset( $children_elements[ $id ] );
                    $newlevel = false;
                    $args[0][\'has_children\'] = 0;
                }
            }
        }else{
            // Wordpress separates out the terms into top level and child terms,
            // making the top level terms very costly as it passes in an empty 
            // array as the children_elements unlike the other terms
            //if($this->hasChildren($element)){
                foreach($this->taxterms as $term){
                    if($term->parent == $element->term_id){
                        if(!$this->hasChildren($term)){
                            $this->noshow[] = $term->term_id;
                            unset($newlevel);
                            $args[0][\'has_children\'] = 0;
                        }
                    }
                }
            //}
        }

        if ( $display )
            parent::display_element( $element, $children_elements, $max_depth, $depth, $args, $output );
    }
}
$a = array(
    \'title_li\'  =>  \'\',
    \'taxonomy\'  =>  \'productcategory\',
    \'walker\'    =>  new Post_Category_Walker(\'productcategory\')
);
wp_list_categories( $a );

$("ul").each(
  function() {
    var elem = $(this);
    if (elem.children().length == 0) {
      elem.remove();
    }
  }
);