amazonのURLを短縮するgreasemonkeyスクリプト cf.http://d.hatena.ne.jp/Cherenkov/20080907/p1

amazon_short_url.user.js

// ==UserScript==
// @name amazon_short_url
// @namespace amazon_short_url
// @include https://www.amazon.co.jp/*
// ==/UserScript==

(function(){

    const asin = document.getElementById('ASIN');
    const title = document.getElementById('title_feature_div');

    if(asin){
        const link = document.createElement('a');
        const url = 'https://www.amazon.co.jp/dp/'+asin.value;

        link.setAttribute('href', url);
        link.appendChild(document.createTextNode(url));

        const add = document.getElementById('centerCol');
        add.insertBefore(link, title);
    }

})();