JAVASCRIPT

adding a button in javascript

// The code below should help
let btn = document.createElement("button");
btn.innerHTML = "Submit";
btn.type = "submit";
btn.name = "formBtn";
document.body.appendChild(btn);

js add html button

let btn = document.createElement("button");
btn.innerHTML = "Save";
btn.onclick = function () {
  alert("Button is clicked");
};
document.body.appendChild(btn);

add button to add item javascript

<script>
    function addItem(){
        var li = document.createElement("LI");  
        var input = document.getElementById("add");
        li.innerHTML = input.value;
        input.value = "";

        document.getElementById("faves").appendChild(li);
    }
</script>

<input type="button" id="btnAdd" value="Add" onclick="addItem()">