为Typecho主题集成文章目录功能（免插件实现文章目录功能）

/* 文章目录开始 */
function createCatalog($obj) {
    //为文章标题添加锚点
    global $catalog;
    global $catalog_count;
    $catalog = array();
    $catalog_count = 0;
    $obj = preg_replace_callback('/<h([1-6])(.*?)>(.*?)<\/h\1>/i', function ($obj) {
        global $catalog;
        global $catalog_count;
        $catalog_count++;
        $catalog[] = array('text' => trim(strip_tags($obj[3])), 'depth' => $obj[1], 'count' => $catalog_count);
        return '<h' . $obj[1] . $obj[2] . '><a name="cl-' . $catalog_count . '"></a>' . $obj[3] . '</h' . $obj[1] . '>';
    }, $obj);
    return $obj;
}

function getCatalog() {
    //输出文章目录容器
    global $catalog;
    $index = '';
    if ($catalog) {
        $index = '<ul>' . "\n";
        $prev_depth = '';
        $to_depth = 0;
        foreach ($catalog as $catalog_item) {
            $catalog_depth = $catalog_item['depth'];
            if ($prev_depth) {
                if ($catalog_depth == $prev_depth) {
                    $index .= '</li>' . "\n";
                } elseif ($catalog_depth > $prev_depth) {
                    $to_depth++;
                    $index .= '<ul>' . "\n";
                } else {
                    $to_depth2 = ($to_depth > ($prev_depth - $catalog_depth)) ? ($prev_depth - $catalog_depth) : $to_depth;
                    if ($to_depth2) {
                        for ($i = 0; $i < $to_depth2; $i++) {
                            $index .= '</li>' . "\n" . '</ul>' . "\n";
                            $to_depth--;
                        }
                    }
                    $index .= '</li>';
                }
            }
            $index .= '<li><a href="#cl-' . $catalog_item['count'] . '">' . $catalog_item['text'] . '</a>';
            $prev_depth = $catalog_item['depth'];
        }
        for ($i = 0; $i <= $to_depth; $i++) {
            $index .= '</li>' . "\n" . '</ul>' . "\n";
        }
        $index = '<div title="目录树" class="gottree glyphicon glyphicon-list"></div>' .
            '<div id="toc-container">' . "\n" .
            $index .
            '</div>' . "\n";
    }
    echo $index;
}
function themeInit($archive) {
    if ($archive->is('single')) {
        $archive->content = createCatalog($archive->content);
    }
}

/* 文章目录结束 */

将以上代码写入function.php文件，然后在需要输出目录的地方加上以下代码。

<?php getCatalog();?>

CSS自己写，记得加上如下JS代码。

$('.gottree').click(function() {
    if ($("#toc-container").css("display") == "none") {
        $("#toc-container").show();
    } else {
        $("#toc-container").hide();
    }
    return false; // 返回false可以避免在原链接后加上#
});