window.onload = function () {
    let addtask = document.getElementById('addtask')
    let todolist = document.getElementById('todolist')
    let newtask = document.getElementById('newtask')
    addtask.on = function () {
        let li = document.createElement('li')
        li.innerText = newtask.value
        todolist.appendChild(li)
    }
}