How to add DOM element script to head section?

Question

I want to add DOM element to head section of HTML. jQuery does not allow adding DOM element script to the head section and they execute instead, Reference.

I want t

Answer 1

var script = $('')
document.getElementsByTagName("head")[0].appendChild(script[0])

But in that case script will not be executed and functions will be not accessible in global namespase. To use code in