在function.php文件加上以下代码：

//分页导航	
function par_pagenavi($range = 9){
	global $paged, $wp_query;
	$max_page = $wp_query->max_num_pages;
	if($max_page > 1){if(!$paged){$paged = 1;}
	echo "<a>共".$max_page."页</a>";
	previous_posts_link('上一页');
    if($max_page > $range){
		if($paged < $range){for($i = 1; $i <= ($range + 1); $i++){echo "<a href='" . get_pagenum_link($i) ."'";
		if($i==$paged)echo " class='current'";echo ">$i</a>";}}
    elseif($paged >= ($max_page - ceil(($range/2)))){
		for($i = $max_page - $range; $i <= $max_page; $i++){echo "<a href='" . get_pagenum_link($i) ."'";
		if($i==$paged)echo " class='current'";echo ">$i</a>";}}
	elseif($paged >= $range && $paged < ($max_page - ceil(($range/2)))){
		for($i = ($paged - ceil($range/2)); $i <= ($paged + ceil(($range/2))); $i++){echo "<a href='" . get_pagenum_link($i) ."'";if($i==$paged) echo " class='current'";echo ">$i</a>";}}}
    else{for($i = 1; $i <= $max_page; $i++){echo "<a href='" . get_pagenum_link($i) ."'";
    if($i==$paged)echo " class='current'";echo ">$i</a>";}}
	next_posts_link('下一页');
    if($paged != $max_page){echo "<a href='" . get_pagenum_link($max_page) . "' class='extend' title='跳转到最后一页'>最后一页</a>";}}
}

参考CSS样式：

.page_navi{width:100%;height:20px;line-height:20px;text-align:left;overflow:hidden;padding-top:1em;}
.page_navi a{padding:1px 4px;margin:2px;text-decoration:none;color:#888;border:1px solid #ccf;}
.page_navi a:hover,.page_navi a.current{border:1px solid #356aa0;color:#356aa0;}

演示：
在endwhile和endif之间加上这段代码：

if(function_exists('wp_page_numbers')) {
	wp_page_numbers();
}
elseif(function_exists('wp_pagenavi')) {
	wp_pagenavi();
} else {
	global $wp_query;
	$total_pages = $wp_query->max_num_pages;
	if ( $total_pages > 1 ) {
		par_pagenavi(4);
	}
}