Answers for "set value in span using javascript"

jquery change span tag text

$('.in-stock span').html("your new string");

set value in span using javascript

//set value in span using jquery
$("#idname").text("your value");

//set value in span using Javascript
document.getElementById("idname").textContent="Your value";
document.getElementById("message").innerHTML="your value";

change span value javascript

document.getElementById("serverTime").innerHTML = ...;