博客美化 之 博客生成三级目录

一.前提条件

最前提的前提条件是已经申请好了js权限，如未申请，可查看：博客美化 之 申请博客园JS权限步骤

1.设置博客标题

 （1）例如下图设置标题2 

 （2）例如下图设置标题3

　　

（3）例如下图设置标题4

二.引入js代码

1.将以下代码放入一个js代码文件中

<!-- 目录索引列表生成 -->
// by hsz
// 亲测，设置标题1为第一层目录不生效
function GenerateContentList()
{
    if ($('#cnblogs_post_body').length == 0) { return; }
    var jquery_h2_list = $('#cnblogs_post_body h2');
    var jquery_h3_list = $('#cnblogs_post_body h3');
    var jquery_h4_list = $('#cnblogs_post_body h4');

    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="first_class_ul">';

        for (var i = 0; i < jquery_h2_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_h2_list[i]).before(go_to_top);
            var li_content = '<li><a href="#_label' + i + '">' + $(jquery_h2_list[i]).text() + '</a></li>';
            var nexth2Index = i + 1;
            if (nexth2Index == jquery_h2_list.length) { nexth2Index = 0; }
            var jquery_h3_list = $(jquery_h2_list[i]).nextUntil(jquery_h2_list[nexth2Index], "h3");
            if (jquery_h3_list.length > 0)
            {
                li_content += '<ul class="second_class_ul">';
            }
            for (var j = 0; j < jquery_h3_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_h3_list[j]).before(go_to_top2);
                li_content +='<li><a href="#_lab2_'+ i +'_' + j + '">' + $(jquery_h3_list[j]).text() + '</a></li>';
                var nexth3Index = j + 1;
                var next;
                if (nexth3Index == jquery_h3_list.length) 
                {
                    if (i + 1 == jquery_h2_list.length)
                    {
                        next = jquery_h2_list[0];
                    }
                    else
                    {
                        next = jquery_h2_list[i + 1];
                    }
                }
                else
                {
                    next = jquery_h3_list[nexth3Index];
                }
                var jquery_h4_list = $(jquery_h3_list[j]).nextUntil(next, "h4");
                if (jquery_h4_list.length > 0)
                {
                    li_content += '<ul class="third_class_ul">';
                }
                for (var k = 0; k < jquery_h4_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_h4_list[k]).before(go_to_third_Content);
                    li_content += '<li><a href="#_label3_' + i + '_' + j + '_' + k + '">' + $(jquery_h4_list[k]).text() + '</a></li>';
                }               
                if (jquery_h4_list.length > 0)
                {
                    li_content += '</ul>';
                }
                li_content += '</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 class="second_class_ul">';
        for(var i =0; i < jquery_h3_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_h3_list[j]).before(go_to_top2);
            var li_content = '<li><a href="#_lab' + i + '">' + $(jquery_h3_list[i]).text() + '</a></li>';
            var nexth2Index = i + 1;
            if (nexth2Index == jquery_h3_list.length) { nexth2Index = 0; }
            var jquery_h4_list = $(jquery_h3_list[i]).nextUntil(jquery_h3_list[i+1], "h4");
            if(jquery_h4_list.length>0)
            {
                li_content +='<ul class="third_class_ul">';
            }
            for(var j = 0;j < jquery_h4_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_h4_list[k]).before(go_to_third_Content);
                li_content +='<li><a href="#_lab2'+ i +'_' + j + '">' + $(jquery_h4_list[j]).text() + '</a></li>';
            }
            if(jquery_h4_list.length>0)
            {
                li_content +='</ul>';
            }
            li_content +='</li>';
            content += li_content;
        }
        content    += '</ul>';
        content    += '</div>'; 
    }
    else if (jquery_h4_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_h4_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_h4_list[k]).before(go_to_third_Content);
            var li_content = '<li><a href="#_label' + i + '">' + $(jquery_h4_list[i]).text() + '</a></li>';
            content += li_content;
        }
        content    += '</ul>';
        content    += '</div>';
    }
    else
    {
        return;
    }
$($('#cnblogs_post_body')[0]).prepend(content);
}
GenerateContentList();

2.上传此文件

3.配置js

(1)配置

找到-->配置—>页脚Html代码

这个是本人的配置路径:

<script src="https://blog-static.cnblogs.com/files/hszstudypy/three_menu.js"></script>

解释：

<script src="https://blog-static.cnblogs.com/files/登录用户名/自己命名js名称"></script>

根据上面进行修改出自己js配置路径。

(2)效果