copylink.js

    function copyURL() {
        var dummy = document.createElement('input'),
        text = window.location.href;
        document.body.appendChild(dummy);
        dummy.value = text;
        dummy.select();
        document.execCommand('copy');
        document.body.removeChild(dummy);
        alert("The link: " + window.location.href + " has been copied");
    }