只需将此添加到循环上方

$args = array(
    \'posts_per_page\' => 10,
    \'category__in\' => array( 2, 6 ), //change and add the category ids here
    \'orderby\' => \'date\',
    \'order\' => \'ASC\')
query_posts($args);

按流行需求更新：）下面是另一个使用tax\\u查询执行相同操作的示例

$args = array(
    \'tax_query\' => array(
        array(
            \'taxonomy\' => \'category\',
            \'field\' => \'slug\',
            \'terms\' => array(\'category1\',\'category2\') ////change and add the category slugs here
        )
    )
    \'posts_per_page\' => 10,
    \'orderby\' => \'date\',
    \'order\' => \'ASC\')
query_posts($args);