前言

起因是群里有人提出，搜索关键词后只能跳转到对应文章，而不能自动再跳转至关键词处，当然，本文不是实现这个(实际上已经实现了)，这给了我一个想法，为啥不弄个文本锚点呢，把选中的文本都保存起来，点击就滚动页面过去，这是一个不错的主意。

功能：选中页面文字保存锚点，点击锚点，页面滚动到对应文本处并背景高亮，当一个锚点对应多处文本时，多次点击锚点，页面能循环地逐个滚动到对应位置。

效果：

实现

首先是右侧悬浮栏的锚点按钮和容器，修改\layout\includes\rightside.pug,对应着原有缩进添加。

when 'anchor'
    if is_post()
        button#post-anchor
            i.fas.fa-book
            #post-anchor-after
            #post-anchor-rom
              #post-anchor-box
                #no-anchor 没有锚点
                script.
                  var anchor_back = '';
                  var anchor_length = 0;
                  var anchor_node = '';
                  function toAnchor(obj) {
                    var anchor = $(obj).text();
                    $("anchorbox").parent().each(function(){ 
                      $(this).html($(this).html().replace(/(<\/?anchorbox.*?>)/g,''));
                    }) 
                    
                    if(anchor_back == anchor){
                      i++;
                      if(i>=anchor_length){
                        i = 0;
                      }
                    }else{
                      i = 0;
                      anchor_back = anchor;
                      anchor_node = $('#article-container *:contains('+anchor+')').not(".highlight *,.mini-sandbox *,.tag.link *,.folding-tag *");
                      anchor_length = anchor_node.length;
                    }
                    if(anchor_length>0){
                      btf.snackbarShow("该锚点对应有 "+anchor_length+" 处文本,当前："+(i+1));
                      btf.scrollToDest(anchor_node.eq(i).offset().top-200);
                    }else{
                      btf.snackbarShow("文章内没有对应文本或出现致命错误，请避免选中跨标签跨行文本。");
                    }
                    let input = anchor;
                    let textNodes = [];
                    (function getTextNodes(node) {
                      if (node.nodeType === Node.TEXT_NODE) {
                        textNodes.push(node);
                      } else {
                        for (let i = 0; i < node.childNodes.length; i++) {
                          getTextNodes(node.childNodes[i]);
                        }
                      }
                    })(document.getElementById("article-container"));
                    for (let i = 0; i < textNodes.length; i++) {
                      let node = textNodes[i];
                      let text = node.nodeValue;
                      let index = text.indexOf(input);
                      if (index !== -1) {
                        let newNode = document.createElement("anchorbox");
                        newNode.appendChild(document.createTextNode(text.substring(index, index + input.length)));
                        node.nodeValue = text.substring(0, index);
                        node.parentNode.insertBefore(newNode, node.nextSibling);
                        node.parentNode.insertBefore(document.createTextNode(text.substring(index + input.length)), newNode.nextSibling);
                      }
                    }
                  }
…………

#rightside
  - const { enable, hide, show } = theme.rightside_item_order
  - const hideArray = enable ? hide && hide.split(',') : ['refresh','translate','enlargePage','narrowPage','bg','darkmode','hideAside']
  //在下面添加个'anchor'
  - const showArray = enable ? show && show.split(',') : ['toc','anchor','chat','comment', 'share']

然后是右键选中文字添加锚点按钮rightside.pug

a.rightMenu-item(href="javascript:addAnchor();")
    script.
        function addAnchor () {
            if($("#no-anchor").length > 0){
                $("#no-anchor").remove();
            }
            var txt = window.getSelection().toString();
            txt = txt.replace(/<[^>]*>/g, "");
            $("#post-anchor-box").prepend('<a class="anchor-item" href="javascript:void(0);" onclick="toAnchor(this)" data-pjax-state="">'+txt+'</a>');
            btf.snackbarShow("成功添加一个文本锚点");
        }
    i.fa.fa-book
    span='添加锚点'

当然没有右键就把js拿去，监听下选中文字后弹出个按钮触发一下addAnchor()就行。右键教程可看自定义右键菜单

添加CSS：

#post-anchor{
    z-index: 10!important;
}
#post-anchor-rom{
    position: fixed;
    width: auto;
    overflow: hidden;
    border-radius: 12px;
    bottom: 20px;
    right: -241px;
    border: var(--anchor-border);
    transition: all .27s;
    opacity: 0;
    max-height: 380px;
    height: 100%;
    width: 240px;
    z-index: 9;
}
#post-anchor-box{
    display:flex;
    background: #fff;
    max-height: 380px;
    height: 100%;
    flex-wrap: nowrap;
    flex-direction: column;
    justify-content: flex-start;
    border-radius: 12px;
    overflow: auto;
}
#post-anchor-after{
    display: none;
    position: fixed;
    bottom: 20px;
    right: 0px;
    background: transparent;
    max-height: 380px;
    height: 100%;
    width: 100px;
}
#post-anchor-box a{
    padding: 5px 10px;
    width: 100%;
    border-bottom: 1px solid rgb(8, 148, 235);
    font-weight: 800;
}
#post-anchor:hover #post-anchor-rom{
    opacity: 1;
    right: 70px;
    transition: all .25s;
}
#post-anchor:hover #post-anchor-after{
    display:block;
}
#article-container anchorbox{
    color: black!important;
    font-weight: 800!important;
    border-radius: 6px!important;
    background-color: rgb(253 253 20 / 70%)!important;
}
a.anchor-item{
    font-size: 16px;
    line-height: 17px;
    text-align: left;
}
a.anchor-item:hover{
    background-color: #16b2ef;
    color: #fff;
}
#no-anchor{
    color: rgb(140, 140, 140);
    font-size: 30px;
    line-height: 375px;
    opacity: 0.8;
}
[data-theme=dark]
#post-anchor-box{
    background: #000;
}
[data-theme=dark]
#article-container anchor{
    color: rgb(255, 255, 255);
}
@media screen and (max-width:768px){
    #rightside #post-anchor{
        display: none!important;
    }
}