JSFiddle - React, Tailwind, and code Playground

HTML

<div id="test"></div>

JavaScript

var str= "2 4 13 14 28 33";
function switchNumbers(a, b) {
    var arr = str.split(" ");
    var first= arr.indexOf(a), second = arr.indexOf(b);
    arr[first] = arr.splice(second, 1, arr[first])[0];
    return arr.join(" ");
}
$("#test").html(switchNumbers("13","28" ));