Make a Todo App with Native JavaScript

Many people share how to make a todo app using JavaScript library like Vue or React. I think by making one with just pure native JavaScript, I can train myself with project structuring. 
    <div>
  <input id ="todoinput">
  <button onclick = "add()">Add</button>
</div>
<ol id = "todos"></ol>
<script>
  var i = 1;
  function add(){
    var newtodo = document.createElement('li');
    newtodo.setAttribute("id","todo" + i);
    newtodo.innerHTML = `${todoinput.value}<button onclick = "deletefunc(${i})">Delete</button><button onclick = "updatefunc(${i})">Update</button>`;
    todos.appendChild(newtodo);
    todoinput.value = "";
    i++;
  };
  
  function deletefunc(n){
  	todos.removeChild(document.getElementById("todo" + n));
  }
    function updatefunc(n){    
      document.getElementById("todo" + n).innerHTML = `${todoinput.value}<button onclick = "deletefunc(${n})">Delete</button><button onclick = "updatefunc(${n})">Update</button>`;
      todoinput.value = "";
  }
</script>

    Keypoints

    1. I use `` to specify todo list item innerHTML and ${} sign to escape into JavaScript code.
    2. The structure of this app is based on inreasing index "i" that is the unique id of each todo list. With this "i", I can control which todo is to delete or update.
    3. One can easily integrate the front-end js code to back-end server via fetch request. This frond end app can prevent user from constant refreshing web browser or sending get request every time a to-do is added, updated or deleted in order to update the user interface. This can reduce access to database and reduce money spent on traffic to database.

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