MediaWiki:Gadget-full-article-links.js

function docReady(fn) {
    // see if DOM is already available
    if (document.readyState === "complete" || document.readyState === "interactive") {
        // call on next available tick
        setTimeout(fn, 1);
    } else {
        document.addEventListener("DOMContentLoaded", fn);
    }
}    
docReady(fullArticleLinks);

function fullArticleLinks() {
	var refs = document.getElementsByClassName('reference-text');
	for (var i = 0; i < refs.length; ++i) {
	    let m = refs[i].innerHTML.search("https://dx.doi.org/") + 19;
	    let n = refs[i].innerHTML.search(" target=\'_blank\'>DOI</a>") - 1;
	    let o = refs[i].innerHTML.substring(m,n);
	    refs[i].innerHTML = refs[i].innerHTML + "<a href='https://" + "s" + "ci-hub.se/" + o + "'>SH</a>";
	}

  }