在博客园的Markdown格式博文中自动生成标题目录

引自：《博客园博文生成章节目录 - qiuhlee - 博客园》 https://www.cnblogs.com/qiuhlee/p/9301120.html

在博客园的管理后台 -> 设置 -> 页脚 HTML 代码 处贴入下面代码

<script language="javascript" type="text/javascript">
function GenerateContentList()
{
    if ($('#cnblogs_post_body').length == 0) { return; }
    var jquery_h1_list = $('#cnblogs_post_body h1');
    var jquery_h2_list = $('#cnblogs_post_body h2');
    var jquery_h3_list = $('#cnblogs_post_body h3');

    if (jquery_h1_list.length != 0)
    {
        var content = '<a name="_labelTop"></a>';
        content    += '<div id="navCategory">';
        content    += '<p style="font-size:18px"><b>目录</b></p>';
        content += '<ul class="first_class_ul">';

        for (var i = 0; i < jquery_h1_list.length; i++)
        {
            var go_to_top = '<div style="text-align: right"><a href="#_labelTop">返回目录</a><a name="_label' + i + '"></a></div>';
            $(jquery_h1_list[i]).before(go_to_top);
            var li_content = '<li><a href="#_label' + i + '">' + $(jquery_h1_list[i]).text() + '</a></li>';
            var nextH1Index = i + 1;
            if (nextH1Index == jquery_h1_list.length) { nextH1Index = 0; }
            var jquery_h2_list = $(jquery_h1_list[i]).nextUntil(jquery_h1_list[nextH1Index], "h2");
            if (jquery_h2_list.length > 0)
            {
                li_content += '<ul class="second_class_ul">';
            }
            for (var j = 0; j < jquery_h2_list.length; j++)
            {
                var go_to_top2 = '<div style="text-align: right"><a href="#_labelTop">返回目录</a><a name="_lab2_'+ i + '_' + j + '"></a></div>';
                $(jquery_h2_list[j]).before(go_to_top2);
                li_content +='<li><a href="#_lab2_'+ i +'_' + j + '">' + $(jquery_h2_list[j]).text() + '</a></li>';
                var nextH2Index = j + 1;
                var next;
                if (nextH2Index == jquery_h2_list.length) 
                {
                    if (i + 1 == jquery_h1_list.length)
                    {
                        next = jquery_h1_list[0];
                    }
                    else
                    {
                        next = jquery_h1_list[i + 1];
                    }
                }
                else
                {
                    next = jquery_h2_list[nextH2Index];
                }
                var jquery_h3_list = $(jquery_h2_list[j]).nextUntil(next, "h3");
                if (jquery_h3_list.length > 0)
                {
                    li_content += '<ul class="third_class_ul">';
                }
                for (var k = 0; k < jquery_h3_list.length; k++)
                {
                    var go_to_third_Content = '<div style="text-align: right"><a href="#_labelTop">返回目录</a><a name="_label3_' + i + '_' + j + '_' + k + '"></a></div>';
                    $(jquery_h3_list[k]).before(go_to_third_Content);
                    li_content += '<li><a href="#_label3_' + i + '_' + j + '_' + k + '">' + $(jquery_h3_list[k]).text() + '</a></li>';
                }               
                if (jquery_h3_list.length > 0)
                {
                    li_content += '</ul>';
                }
                li_content += '</li>';
            }
            if (jquery_h2_list.length > 0)
            {
                li_content +='</ul>';
            }
            li_content +='</li>';
            content += li_content;
        }
        content    += '</ul>';
        content    += '</div>';
    }
    else if (jquery_h2_list.length != 0)
    {
        var content = '<a name="_labelTop"></a>';
        content    += '<div id="navCategory">';
        content    += '<p style="font-size:18px"><b>目录</b></p>';
        content    += '<ul class="second_class_ul">';
        for(var i =0; i < jquery_h2_list.length; i++)
        {
            var go_to_top2 = '<div style="text-align: right"><a href="#_labelTop">返回目录</a><a name="_lab2_'+ i + '_' + j + '"></a></div>';
            $(jquery_h2_list[j]).before(go_to_top2);
            var li_content = '<li><a href="#_lab' + i + '">' + $(jquery_h2_list[i]).text() + '</a></li>';
            var nextH1Index = i + 1;
            if (nextH1Index == jquery_h2_list.length) { nextH1Index = 0; }
            var jquery_h3_list = $(jquery_h2_list[i]).nextUntil(jquery_h2_list[i+1], "h3");
            if(jquery_h3_list.length>0)
            {
                li_content +='<ul class="third_class_ul">';
            }
            for(var j = 0;j < jquery_h3_list.length;j++)
            {                  
                var go_to_third_Content = '<div style="text-align: right"><a href="#_labelTop">返回目录</a><a name="_label3_' + i + '_' + j + '_' + k + '"></a></div>';
                $(jquery_h3_list[k]).before(go_to_third_Content);
                li_content +='<li><a href="#_lab2'+ i +'_' + j + '">' + $(jquery_h3_list[j]).text() + '</a></li>';
            }
            if(jquery_h3_list.length>0)
            {
                li_content +='</ul>';
            }
            li_content +='</li>';
            content += li_content;
        }
        content    += '</ul>';
        content    += '</div>'; 
    }
    else if (jquery_h3_list.length != 0) 
    {
        var content = '<a name="_labelTop"></a>';
        content    += '<div id="navCategory">';
        content    += '<p style="font-size:18px"><b>目录</b></p>';
        content    += '<ul>';
        for(var i = 0; i < jquery_h3_list.length; i++)
        {
            var go_to_third_Content = '<div style="text-align: right"><a href="#_labelTop">返回目录</a><a name="_label3_' + i + '_' + j + '_' + k + '"></a></div>';
            $(jquery_h3_list[k]).before(go_to_third_Content);
            var li_content = '<li><a href="#_label' + i + '">' + $(jquery_h3_list[i]).text() + '</a></li>';
            content += li_content;
        }
        content    += '</ul>';
        content    += '</div>';
    }
    else
    {
        return;
    }
    $($('#cnblogs_post_body')[0]).prepend(content);
}
GenerateContentList();
</script>

下面设计几个级别标题，展示效果：

二级标题

三级标题

四级标题

这是内容这是内容这是内容这是内容这是内容这是内容这是内容这是内容这是内容这是内容

三级标题

四级标题

这是内容这是内容这是内容这是内容这是内容这是内容这是内容这是内容

二级标题

三级标题

四级标题

这是内容这是内容这是内容这是内容这是内容这是内容这是内容这是内容这是内容这是内容