クリップボードにコピーするブックマークレット（要babel+babili）

hoge.js

(() => {
    let w = window, d = document, db = d.body;
    let format = () => {
        return "[" + d.title + "](" + d.URL + ")";
    };

    if (w.__z0 !== undefined) {
        w.__z0.onClick({currentTarget: w.__z0d});
        return;
    }

    let script = d.createElement('script')
    let scriptSelector= '__z0';
    script.src = 'https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/1.6.0/clipboard.js'
    script.classList.add(scriptSelector)
    if (d.querySelector('.' + scriptSelector) == null) {
        db.appendChild(script);
    }

    let timer = null;
    timer = setInterval(() => {
        if (w.Clipboard === undefined) {
            return
        }
        clearInterval(timer);

        let cls = scriptSelector + 'x';
        let selector = "." + cls;

        db.innerHTML += "<button class='" + cls + "' style='margin-left:-9999px'></button>";
        w.__z0d = d.querySelector(selector);

        w.__z0 = new Clipboard(w.__z0d, {
            text: function(trigger) {
                return format();
            }
        });
        w.__z0.on('success', function(e) {
            alert('Copied!!\n\n' + e.text);
        });

        w.__z0.onClick({currentTarget: w.__z0d});
    }, 16);
})();