how to add appendchild in javascript code example

Example 1: JavaScript append text to div

var div = document.getElementById('myElementID');
div.innerHTML += "Here is some more data appended";

Example 2: add a child html object to another html object in js

//Add child at end of object children list
parent.append(child);
//Add child at start of object children list
parent.insertBefore(child, list.childNodes[0]);