JQuery Load Javascript Dynamically | Dynamic JS Loading

var script = document.createElement("SCRIPT");
script.src = '//code.jquery.com/jquery-latest.min.js';
script.type = 'text/javascript';
script.onload = function() {
    var nj = jQuery.noConflict(true);
    alert(jn.find("body").length);
};
document.getElementsByTagName("head")[0].appendChild(script);