键盘实现WordPress翻页

如果能用键盘方向键实现上下翻页操作是不是会很方便，闲来无事，折腾一下键盘实现WordPress翻页功能。实现方法很简单，一段JS代码搞定。

<?php wp_reset_query();if (is_home() || is_archive() || is_search()) { ?>
<script type=“text/javascript”>
document.onkeydown = chang_page;function chang_page(e) {
var e = e || event,
keycode = e.which || e.keyCode;
if (keycode == 33 || keycode == 37) location = ‘<?php echo get_previous_posts_page_link(); ?>’;
if (keycode == 34 || keycode == 39) location = ‘<?php echo get_next_posts_page_link(); ?>’;
}
</script>
<?php } ?>
<?php wp_reset_query();if (is_single()) { ?>
<script type=“text/javascript”>
document.onkeydown = chang_page;function chang_page(e) {
var e = e || event,
keycode = e.which || e.keyCode;
if (keycode == 33 || keycode == 37) location = ‘<?php echo get_permalink(get_adjacent_post(false, ”, false)); ?>’;
if (keycode == 34 || keycode == 39) location = ‘<?php echo get_permalink(get_adjacent_post(false, ”, true)); ?>’;
}
</script>
<?php } ?>