How to inject jquery to any webpage [duplicate]

This is a bookmarklet code to inject jquery in any webpage:

javascript: (function (){
    function l(u, i) {
        var d = document;
        if (!d.getElementById(i)) {
            var s = d.createElement('script');
            s.src = u;
            s.id = i;
            d.body.appendChild(s);
        }
    } l("https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js", 'jquery')
})();

Update:
I removed the http: part from the URL per @Monkpit comment, which is very important and saves a lot of problems.