我为您提供了一个php解决方案：

add_filter(\'wp_terms_checklist_args\', \'htmlandcms_select_one_category\');
function htmlandcms_select_one_category($args) {
    if (isset($args[\'taxonomy\']) && $args[\'taxonomy\'] == \'category_portfolio\') {
        $args[\'walker\'] = new Walker_Category_Radios;
        $args[\'checked_ontop\'] = false;
    }
    return $args;
}

class Walker_Category_Radios extends Walker {
    var $tree_type = \'category\';
    var $db_fields = array (\'parent\' => \'parent\', \'id\' => \'term_id\');

    function start_lvl( &$output, $depth = 0, $args = array() ) {
        $indent = str_repeat("\\t", $depth);
        $output .= "$indent<ul class=\'children\'>\\n";
    }

    function end_lvl( &$output, $depth = 0, $args = array() ) {
        $indent = str_repeat("\\t", $depth);
        $output .= "$indent</ul>\\n";
    }

    function start_el( &$output, $category, $depth, $args, $id = 0 ) {
        extract($args);
        if ( empty($taxonomy) )
            $taxonomy = \'category\';

        if ( $taxonomy == \'category\' )
            $name = \'post_category\';
        else
            $name = \'tax_input[\'.$taxonomy.\']\';

        /** @var $popular_cats */
        $class = in_array( $category->term_id, $popular_cats ) ? \' class="popular-category"\' : \'\';
        /** @var $selected_cats */
        $output .= "\\n<li id=\'{$taxonomy}-{$category->term_id}\'$class>" . \'<label class="selectit"><input value="\' . $category->term_id . \'" type="radio" name="\'.$name.\'[]" id="in-\'.$taxonomy.\'-\' . $category->term_id . \'"\' . checked( in_array( $category->term_id, $selected_cats ), TRUE, FALSE ) . disabled( empty( $args[\'disabled\'] ), FALSE, FALSE ) . \' /> \' . esc_html( apply_filters(\'the_category\', $category->name )) . \'</label>\';
    }

    function end_el( &$output, $category, $depth = 0, $args = array() ) {
        $output .= "</li>\\n";
    }
}

我不知道你是否找到了解决方法，但我需要做同样的事情。我接受了您的jQuery并为名称添加了引号+转义了它们。对我来说似乎工作得很好，所以感谢原始jQuery：）

    jQuery("input[name=\\"tax_input[location][]\\"]").click(function () {
        selected = jQuery("input[name=\\"tax_input[location][]\\"]").filter(":checked").length;
        if (selected > 1){
            jQuery("input[name=\\"tax_input[location][]\\"]").each(function () {
                    jQuery(this).attr("checked", false);
            });
            jQuery(this).attr("checked", true);
        }
    });

这是我在函数中加入的内容，但我似乎没有得到预期的结果。

<?php add_action( \'admin_head\', \'cat_sel\' ); function cat_sel() {    ?>

<script type="text/javascript">
jQuery(document).ready(function($) {
  jQuery("input[name=\\"tax_input[rooms][]\\"]").click(function () {
    selected = jQuery("input[name=\\"tax_input[rooms][]\\"]").filter(":checked").length;
    if (selected > 1){
        jQuery("input[name=\\"tax_input[rooms][]\\"]").each(function () {
                jQuery(this).attr("checked", false);
        });
        jQuery(this).attr("checked", true);
    }
  });
});

</script>
<?php } ?>

的简化版本@sviryatko\'s PHP解决方案：

namespace {
    require_once(ABSPATH . \'wp-admin/includes/class-walker-category-checklist.php\');
    class Walker_Category_Radioset extends Walker_Category_Checklist {
        public function start_el(&$output, $category, $depth = 0, $args = array(), $id = 0) {
            $parent_output = \'\';
            parent::start_el($parent_output, $category, $depth, $args, $id);
            $output .= str_replace(\'checkbox\', \'radio\', $parent_output);
        }
    }
}

add_filter(
    \'wp_terms_checklist_args\'
    , function($args) {
        if (isset($args[\'taxonomy\']) && $args[\'taxonomy\'] == YOUR_TAXONOMY) {
            $args[\'walker\'] = new \\Walker_Category_Radioset;
            $args[\'checked_ontop\'] = false;
        }
        return $args;
    }
);