how to append in javascript

var colors=["red","white"];
colors.push("blue");//append 'blue' to colorsvar colors= ["red","blue"];
	colors.push("yellow"); var div = document.getElementById('myElementID');
div.innerHTML += "Here is some more data appended";var fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.push("Kiwi");        
            
        
     let app = document.querySelector('#app');
app.append('append() Text Demo');

console.log(app.textContent);var list=[1, 2, 3, 4, 5];
list.push(6);
// .push allows you to add a value to the end of a list