How to pass to assign an variable value to an element

I have an element and I am trying to pass a variable value of another element. here is my code

var links = document.createElement ('li');
 var img = document.createElement( 'img');
img.src = option.image;  // this gives the path of the image
img.alt = option.prompt;

links.appendChild( img );

var s1 = document.createElement('span');

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In the above code I want to display option.prompt  ( the value) in s1. So using createTextNode won't help as it will only display option.prompt but not its value. this is where I am stuck.

any advice or examples are appreciated