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) {
		if (refs[i].innerHTML.includes("https://dx.doi.org/") === true){
			var m = refs[i].innerHTML.search("https://dx.doi.org/") + 19;
		    var n = refs[i].innerHTML.search("DOI</a>") - 2;
		    var o = refs[i].innerHTML.substring(m,n);
		    refs[i].innerHTML = refs[i].innerHTML + "<a href='https://" + "s" + "ci-hub.se/" + o + "'>SH</a>";		
		}
	}
  }