GitHub の Markdown に TOC (目次) を付けるブックマークレット ref: http://qiita.com/kobake@github/items/3f29a0e20ae4c49e0c81

github-markdown-toc-bookmarklet

javascript:(function(){/* style */var style = (function () {/*.toc{border: 1px solid #aaa;padding: 4px 12px;margin-bottom: 12px;position: relative;padding-top: 30px;}.toc-title{display: inline-block;width: auto;background-color: #ccc;position: absolute;left: 0px;top: 0px;font-size: 8pt;padding: 2px 4px;padding-right: 8px;color: #666;}.toc-h{font-size: 11pt;}.toc-h1{}.toc-h2{margin-left: 20px;}.toc-h3{margin-left: 40px;}*/}).toString().match(/[^]*\/\*([^]*)\*\/\}$/)[1];$('.toc-style').remove();$('body').append($('<style class="toc-style">\n' + style + '\n</style>'));/* toc frame */$('.toc').remove();var $toc = $('<div class="toc"><div class="toc-title">TOC</div></div>');$toc.prependTo($('.markdown-body'));/* each links */$('.markdown-body h1, .markdown-body h2, .markdown-body h3').each(function(){/* level */var tagName = $(this).prop('tagName').toLowerCase();/* link div */var $div = $('<div class="toc-h toc-' + tagName + '"></div>');/* link */var $a = $('<a href=""></a>');$a.appendTo($div);$a.text($(this).text());$a.attr('href', $(this).find('a:first').attr('href'));/* append */$toc.append($div);});})();

github-markdown-toc.js

// style
var style = (function () {/*
    .toc{
        border: 1px solid #aaa;
        padding: 4px 12px;
        margin-bottom: 12px;
        position: relative;
        padding-top: 30px;
    }
    .toc-title{
        display: inline-block;
        width: auto;
        background-color: #ccc;
        position: absolute;
        left: 0px;
        top: 0px;
        font-size: 8pt;
        padding: 2px 4px;
        padding-right: 8px;
        color: #666;
    }
    .toc-h{
        font-size: 11pt;
    }
    .toc-h1{
    }
    .toc-h2{
        margin-left: 20px;
    }
    .toc-h3{
        margin-left: 40px;
    }
*/}).toString().match(/[^]*\/\*([^]*)\*\/\}$/)[1];
$('.toc-style').remove();
$('body').append($('<style class="toc-style">\n' + style + '\n</style>'));

// toc frame
$('.toc').remove();
var $toc = $('<div class="toc"><div class="toc-title">TOC</div></div>');
$toc.prependTo($('.markdown-body'));

// each links
$('.markdown-body h1, .markdown-body h2, .markdown-body h3').each(function(){
    // level
    var tagName = $(this).prop('tagName').toLowerCase();

    // link div
    var $div = $('<div class="toc-h toc-' + tagName + '"></div>');

    // link
    var $a = $('<a href=""></a>');
    $a.appendTo($div);
    $a.text($(this).text());
    $a.attr('href', $(this).find('a:first').attr('href'));

    // append
    $toc.append($div);
});