直クリップボード行き出来たぞ
javascript:(function(){location.href.match(/\d+\.html/);var p=document.createElement('p');
p.textContent='http://www.aliexpress.com/item//'+RegExp.lastMatch;p.setAttribute('id','ali2ch46');
p.setAttribute('class','ali2ch46');document.body.appendChild(p);var $target=document.querySelector('.ali2ch46');
var range=document.createRange();range.selectNode($target);window.getSelection().removeAllRanges();
window.getSelection().addRange(range);document.execCommand('copy');
document.body.removeChild(document.getElementById('ali2ch46'))})();

chromeでのみ確認