Asynchronous Script Loading Callback

Question

http://jsfiddle.net/JamesKyle/HQDu6/

I\'ve created a short function based on Mathias Bynens Optimization of the Google Analytics asynchr

Answer 1

The other answers works well, but aren't super readable or require Promises. Here is my two cents:

function loadScript(src, callback) {
    var script = document.createElement('script');
    script.setAttribute('src', src);
    script.addEventListener('load', callback);
    document.head.appendChild(script);
},