Answer 1

我认为最简单的方法是过滤wp_dropdown_...的输出并在结束select标记之前注入您的选项;

function insert_home_in_dropdown($output)
{
    $end = '<option value="whatever">Home</option></select>';
    return preg_replace('#</select>$#', $end, trim($output)); 
}
add_filter('wp_dropdown_pages', 'insert_home_in_dropdown');

Answer 2

我的代码看起来像这样，在我的functions.php代码中，我将值编辑为0。

    var dropdownf = document.getElementById("page_id");
                function onPageChange() {
                if ( dropdownf.options[dropdownf.selectedIndex].value > 0 ) {
                location.href = "<?php echo get_option('home'); ?>/?page_id="+dropdownf.options[dropdownf.selectedIndex].value;
                    }

                if ( dropdownf.options[dropdownf.selectedIndex].value == 0 ) {
                location.href = "<?php echo get_option('home'); ?>"; // this give the href to the home link 
                    }

                }
                dropdownf.onchange = onPageChange;